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product structure silicon monolithic integrated circuit this product is not designed prot ection against radioactive rays . 1/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. 3.jun.2013 rev.001 tsz22111 ? 14 ? 001 www.rohm.com datashee t max. 28.5v output 2strings(25ma/ch) white led driver BD65B60GWL general description bd65b60 is a white led driver ic that integrates pwm step-up dc/dc converter with boost-capability of up to maximum 28.5v and current driver with drive capability of up to 25ma(typ.) maximum setting. precise brightness can be controlled at wide ranges through the external pwm pulse input. this ic features highly accurate current drivers with low differential current errors between channels, thus, reducing brightness spots on the lcd panel. moreover, its small package is suited for saving space. features ? high efficiency pwm step-up dc/dc converter f sw1 = 1.1mhz(typ.), f sw2 = 0.60mhz(typ.) ? high accuracy & good matching current drivers (2ch) ? soft start function ? drives up to 8 leds in series per channel ? lower input voltage range requirement (2.7v to 5.5v) applications backlight for smartphones, games, digital video cameras, digital single-lens reflexes, digital still cameras, digital photo frames, portable dvd player, etc. key specifications ? input voltage range: 2.7v to 5.5v ? output voltage range: max. 28.5v ? operational led channel: 2ch or 1ch ? switching frequency: 0.6mhz/1.1mhz(typ.) ? led current per channel: 25ma (max.) ? led current accuracy: 3.0% (max.) ? quiescent current 0 a (typ.) ? operating temperature range: -40c to +85c package w(typ.) x d(typ.) x h(max.) ucsp50l1 (12pin) 1.40mm x 1.80mm x 0.55mm pin configuration (bottom view) typical application circuit d sw vout led2 c gnd reset led1 b vbat pwm scl a iset vio sda 1 2 3 2.7v to 5.5v cout cvbat controller vbat reset sw led1 led2 vout pwmin scl sda vio 1.65v to 3.3v gnd rset iset pwm 10 h BD65B60GWL cvio downloaded from: http:///
datasheet datasheet 2/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 pin descriptions pin no. pin name i/o function terminal diagram a1 iset in resistor connection for led current setting a a2 vio in vio voltage terminal. connect a 1.65v to 3.3v supply to vio and bypass to gnd with a 0.1f or greater ceramic capacitor. b a3 sda in serial data input for i 2 c interface this pin is needed to connect external pull-up resistor to vio pin. please refer to p.37 sda, scl pull-up resistor selection. b b1 vbat in vbat voltage terminal. connect a 2.7v to 5.5v supply to vbat and bypass to gnd with a 1.0f(typ.) or greater ceramic capacitor. c b2 pwm in input pin for controlling the current driver. this pin has an internal pull-down resistor. please refer to p.35 brightness control b b3 scl in serial clock input for i 2 c interface this pin is needed to connect external pull-up resistor to vio pin. please refer to p.37 sda, scl pull-up resistor selection. b c1 gnd - power ground for internal switching transistor c c2 reset in active-low reset. pull this pin high to enable the ic. this pin is needed to connect external pull-down resistor. please refer to p.29 functional descriptions b c3 led1 in input terminal to internal current driver. led cathode connection. b d1 sw out switching terminal where an external inductor is connected. internally connects to an nmos switch. connect the inductor as close as possible to sw terminal to reduce parasitic inductance and capacitance. please refer to pcb layout of p.39. b d2 vout in terminal for monitoring the output voltage of switching regulator. also, detects sbd open and ovp. please refer to p.31. connect vout to the positive terminal of the output capacitor (cout). recommended cout value is 1.0f(typ.) for dc mode or 2.2f(typ.) for pwm mode. b d3 led2 in input terminal to internal current driver. led cathode connection. b gnd pin b vbat c gnd gnd vbat a pin downloaded from: http:///
datasheet datasheet 3/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 block diagram 2.7v to 5.5v 2.2 f 1 f 10 h vbat tsd reset uvlo fault detector sw output short protect output over voltage protect led terminal short detector led return select led1 led2 vout + - current sense over current protect control sense osc + erramp pwm comp 2ch current driver + - pwmin scl sda vio 8bit dac 1.1 or 0.6mhz reset i2c soft start ref x1, x0.8, x0.6, x0.4 vshort=no, 5.4v gnd pre-driver current ratio setting fb voltage setting 31v/28v 23.5v iset driver + - rset ise t pwm logic (0.1 f) controller 3v description of block the lowest voltage between led1 and led2 pi ns is detected when ic is powered on. output voltage is kept constant by controlling the switching duty through the feedback voltage which is set at 0.3v(typ.). the pwm current mode dc/dc converter is controlled by the two inputs of the comparator: one is the differential output fr om the error amplifier and the other is the sum of current sensing and the ramp signal generated by the oscillator. these combined signals prevent the sub-harmonic oscillation in pwm current mode. the pwm output controls internal switch n-channel transistor via the rs latch. energy is accumulated in the external inductor when the gate of the n-chan nel transistor is on, while energy is transferred to the output capacitor via external sbd when the n-channel transistor is off. led brightness is controlled by the current driver which can be set by: external resistor rset, 8-bit dac current ratio and pwm control that is selectable as dc or pulse input. furthermore, this ic has several protection functions such as thermal shutdown, over-cu rrent protection, under-voltage lockout, over-voltage protection, external sbd open detection, led open and short detection. their respective detection signals stop the switching operation instantly. downloaded from: http:///
datasheet datasheet 4/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 absolute maximum ratings (ta=+25c) parameter symbol limits unit condition maximum applied voltage 1 v max1 7 v vbat, vio, pwm, sda, scl, reset, iset maximum applied voltage 2 v max2 34 v sw, led1,led2, vout power dissipation pd1 650 mw power dissipation derates by 5.2mw/ oc when operating above 25 oc (when mounted on rohms standard board) power dissipation is calculated by formula : pd=(storage temperature max - 25c )/ ?? ja (ex. pd1=5.2mw/c) operating temperature range topr -40 to +85 c - storage temperature range tstg -55 to +150 c - recommended operating ratings (ta=+25c) parameter symbol limits unit conditions min. typ. max. power supply voltage v bat 2.7 3.6 5.5 v power supply vio input voltage (io) v io 1.65 3.0 3.3 v i/o powe r supply (vio<=vbat) electrical characteristics (unless otherwise specified, vbat=3.6v, vio=3.0v, ta=+25c) parameter symbol limits unit conditions min. typ. max. [general] quiescent current (vbat) i qvbat - - 1.0 a reset=0v quiescent current (vio) i qvio - - 1.0 a reset=0v standby current (vbat) i stb - 2.0 4.0 a reset=1.8v, ad0eh, data=00h current consumption (vbat) for current driver 1ch i bat1ch - 0.80 - ma reset=1.8v, vout=open fsw=1.1mhz, ad03h, data=01h current consumption (vbat) for current driver 2ch i bat2ch - 0.85 - ma reset=1.8v, vout=open fsw=1.1mhz, ad03h, data=05h current consumption (vio) i ddvio - - 100 a reset=1.8v, vout=open sda=scl=50%@400khz (3.0v) [reset, pwm terminal] low level input voltage v thl - - 0.5 v high level input voltage v thh 1.4 - - v reset input current i rstin - - 1 a reset output current i rstout -1 - - a pwm pull down resistor r pwm - 300 - k ? [sda, scl terminal] low level input voltage v ili -0.3 - 0.25xvio v high level input voltage v ihi 0.75xvio - vio+0.3 v l level output voltage (for sda pin) v ol - - 0.3 v iol=3ma input current i sin -3 - 3 a input voltage = from (0.1 x vio) to (0.9 x vio) downloaded from: http:///
datasheet datasheet 5/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 electrical characteristics (unless otherwise specified, vbat=3.6v, vio=3.0v, ta=+25c) parameter symbol limits unit conditions min. typ. max. [switching regulator] led control voltage1 v led1 0.40 0.50 0.60 v ad02h,data=00h led control voltage2 v led2 - 0.40 - v ad02h,data=01h led control voltage3 v led3 - 0.30 - v ad02h,data=02h led control voltage4 v led4 - 0.20 - v ad02h,data=03h switching frequency accuracy f sw 0.88 1.10 1.32 mhz fosc(ad02h d2)=1 duty cycle limit d max 90.0 95.0 99.0 % led1-2=0.3v, fsw=1.1mhz sw nch fet ron r on - 0.3 - ? isw=80ma, vbat=3.6v sw transistor leak current i qsw - 0.1 2.0 a reset =0v, sw=18v vout range v range vbat+1v - ovp-1v v under ovp voltage [protection] under voltage lock out (fall) v uvlo - 2.1 - v vbat falling edge under voltage lock out (rise) v uvloh - 2.3 - v vbat rising edge over current limit 1 i ocp1 - 1000 - ma vbat=2.7v, ad01h,data=01h *1 over current limit 2 i ocp2 - 1700 - ma vbat=2.7v, ad01h,data=00h *1 over voltage limit input1 v ovp1 29.5 31 33 v vout rising edge, ad01h,data=10h over voltage limit input2 v ovp2 27 28 29.5 v vout rising edge, ad01h,data=01h over voltage limit input3 v ovp3 22.5 23.5 24.7 v vout rising edge, ad01h,data=00h or 11h over voltage limit hysteresis v ovphys - 1 - v output short protect v ovpfault - 0.2 0.5 v detect voltage of vout pin vout leak current i ovl - 0.1 1.0 a reset=0v, vout=18v (ovp=31v) led terminal over voltage protect v sc 4.5 5.4 6.3 v [current driver] led maximum current setting range i lmax 5.0 - 25.0 ma this value is characteristics of current driver. led current step i ledstp - 256 - step led1, 2 led current accuracy 1 i laccu1 - - 3.0 % imax=15.0ma led current dac linearity 1 (design target ) i dalin1 - - 2.0 % range = 10.02ma to 15ma rset resistor =15.0ma setting *2 dac register : ad05h, data=aah to ffh led current dac linearity 2 (design target) i dalin2 - - 3.0 % range = 5.04ma to 9.96ma rset resistor =15.0ma setting *2 dac register : ad05h, data=55h to a9h led current matching i lmat - - 2.0 % (max led current C average current) / average current led current limit i locp - 0 0.1 ma current limit value at iset resistor 1k ? setting led leak current i qled - 0.1 1.0 a reset=0v, led1&led2=18v *1 this parameter is tested with dc measurement *2 condition: rset resistor = 40k ? , iled = 15.0ma setting calculation: idalin1=(iled(xxh)/iled(ffh) x 256/(xxh+1)) - 1 downloaded from: http:///
datasheet datasheet 6/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v pwm=0v(gnd) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 -40 -15 10 35 60 85 temp (c) i qvio (a) vio=1.65v vio=3.0v vio=3.3v 0 0.5 1 1.5 2 2.5 3 3.5 4 - 40 - 15 10 35 60 85 temp (c ) i qvbat (a) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.5 1 1. 5 2 2.5 3 3.5 4 4.5 5 -40 -15 10 35 60 85 tem p (c) i stb (a) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 - 4 0 - 15 10 3 5 6 0 8 5 tem p (c) i bat1ch (ma) vbat=2.7v vbat=3.6v vbat=5.5v figure 1. quiescent current (vbat) vs temperature figure 2. quiescent current (vio) vs temperature figure 3. standby current (vbat) vs temperature figure 4. current consumption (vbat) 1ch vs temperature vio=3.0v reset=0v vbat=3.6v reset=0v vio=3.0v reset=1.8v vio=3.0v reset=1.8v downloaded from: http:///
datasheet datasheet 7/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 5 10 15 20 25 30 35 40 45 -40 -15 10 35 60 85 temp (c) i ddvi o (a) vio=1.65v vio=3.0v vio=3.3v 0.4 0.6 0.8 1 1. 2 1. 4 -40 -15 10 35 60 85 tem p (c) v th (v) vbat=2.7v vbat=3.6v vbat=5.5v 0.4 0.6 0.8 1 1. 2 1. 4 -40 -15 10 35 60 85 tem p (c) v th (v) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 - 4 0 - 15 10 3 5 6 0 8 5 tem p (c) i bat2ch (ma) vbat=2.7v vbat=3.6v vbat=5.5v figure 5. current consumption (vbat) 2ch vs temperature figure 6. current consumption (vio) vs temperature figure 7. reset threshold voltage vs temperature figure 8. pwm threshold voltage vs temperature vio=3.0v reset=1.8v vbat=3.6v reset=1.8v downloaded from: http:///
datasheet datasheet 8/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 20 40 60 80 100 120 140 160 180 200 0 0.6 1.2 1.8 2.4 3 reset (v) i rst in / i rst out (na) vbat=3.6v t= 25c 0 50 100 150 200 250 300 350 0 0.4 0.8 1.2 1.6 2 pwm voltage (v) r pwm (k ? ) vbat=3.6v t= 25c 0 0.5 1 1. 5 2 2.5 3 -40 -15 10 35 60 85 tem p (c) v th (v) vio=1.65v vio=3.0v vio=3.3v 0 0.5 1 1. 5 2 2.5 3 -40 -15 10 35 60 85 tem p (c) v th (v) vio=1.65v vio=3.0v vio=3.3v figure 9. reset input and output current vs reset voltage figure 10. pwm pull-down resistance vs pwm voltage figure 11. sda threshold voltage vs temperature figure 12. scl threshold voltage vs temperature downloaded from: http:///
datasheet datasheet 9/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 20 40 60 80 10 0 -40 -15 10 35 60 85 tem p (c) v ol (mv) vbat=2.7v vbat=3.6v vbat=5.5v 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 200 0 0 .3 0 .6 0.9 1.2 1.5 1.8 sda (v) i sin (na) vbat=3.6v vio=3v t=25c 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 200 0 0.3 0 .6 0.9 1.2 1.5 1.8 scl (v) i sin (na) vbat=3.6v vio=3v t=25c 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -15 10 35 60 85 tem p (c) v led1 (v) vbat=2.7v vbat=3.6v vbat=5.5v figure 13. sda l level output voltage vs temperature figure 14. sda input current vs sda voltage figure 15. scl input current vs scl voltage figure 16. led control voltage 1 vs temperature (feedback voltage=0.5v setting) downloaded from: http:///
datasheet datasheet 10/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -15 10 35 60 85 tem p (c) v led2 (v) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -15 10 35 60 85 tem p (c) v led3 (v) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -15 10 35 60 85 tem p (c) v led4 (v) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.2 0.4 0.6 0.8 1 1. 2 1. 4 -40 -15 10 35 60 85 tem p (c) f sw (mhz) vbat=2.7v vbat=3.6v vbat=5.5v figure 17. led control voltage 2 vs temperature (feedback voltage=0.4v setting) figure 18. led control voltage 3 vs temperature (feedback voltage=0.3v setting) figure 19. led control voltage 4 vs temperature (feedback voltage=0.2v setting) figure 20. switching frequency (1.1mhz) vs temperature downloaded from: http:///
datasheet datasheet 11/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 -40 -15 10 35 60 85 tem p (c) f sw (mhz) vbat=2.7v vbat=3.6v vbat=5.5v 90 92 94 96 98 10 0 - 4 0 - 15 10 3 5 6 0 8 5 tem p (c) d max (%) vbat=2.7v vbat=3.6v vbat=5.5v 10 11 12 13 14 15 -40 -15 10 35 60 85 tem p (c) d min (%) vbat=2.7v vbat=3.6v vbat=5.5v 0 10 0 200 300 400 50 0 600 70 0 -40 -15 10 35 60 85 tem p (c) r on (m ? ) vbat=2.7v vbat=3.6v vbat=5.5v figure 21. switching frequency (0.6mhz) vs temperature figure 22. maximum duty cycle limit vs temperature figure 23. minimum duty cycle limit vs temperature figure 24. sw nch fet ron (at i sw =80ma) vs temperature downloaded from: http:///
datasheet datasheet 12/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 0.02 0.04 0.06 0.08 0.1 - 40 - 15 10 35 60 85 temp (c ) i qsw (a) temp=25c vbat=3.6v reset=0v sw= 25v 0 0.2 0.4 0.6 0.8 1 1. 2 1. 4 1. 6 1. 8 2 -40 -15 10 35 60 85 tem p (c) i ocp1 (a) vbat=2.7v vbat=3.6v vbat=5.5v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 - 40 -15 10 35 60 85 temp (c ) i ocp2 (a) vbat=2.7v vbat=3.6v vbat=5.5v figure 25. sw leak current vs temperature figure 26. under voltage lock out (rise/fall) figure 27. current limit (1a) vs temperature figure 28. current limit (1.7a) vs temperature 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 -40 -15 10 35 60 85 uvlo(v) tem p ( c ) rising falling downloaded from: http:///
datasheet datasheet 13/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 20 21 22 23 24 25 26 27 28 - 40 -15 10 35 60 85 temp ( c ) v ovp1 (v) vbat=2.7v vbat=3.6v vbat=5.5v 24 25 26 27 28 29 30 31 32 - 40 -15 10 35 60 85 temp ( c ) v ovp2 (v) vbat=2.7v vbat=3.6v vbat=5.5v 27 28 29 30 31 32 33 34 35 - 40 -15 10 35 60 85 temp ( c ) v ovp3 (v) vbat=2.7v vbat=3.6v vbat=5.5v 0.0 0.5 1.0 1.5 2.0 2.5 3.0 - 40 - 15 10 35 60 85 temp ( c ) v ovphys (v) vbat=2.7v vbat=3.6v vbat=5.5v figure 29. over voltage protection 1 (23.5v) vs temperature figure 30. over voltage protection 2 (28v) vs temperature figure 31. over voltage protection 3 (31v) vs temperature figure 32. over voltage protection hysteresis vs temperature downloaded from: http:///
datasheet datasheet 14/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 0.1 0.2 0.3 0.4 0.5 - 40 -15 10 35 60 85 temp (c ) i ovl (a) vbat=3.6v vbat=3.6v reset=0v vout= 20v 0 0.2 0.4 0.6 0.8 1 - 40 -15 10 35 60 85 temp (c ) i qled (a) vbat=3.6v reset=0v vout=vled= 33v figure 33. output short protect figure 34. vout leak current vs temperature figure 35. led terminal over voltage protect vs temperature figure 36. led1, led2 leak current vs temperature 0 100 200 300 400 500 600 700 800 900 1000 - 40 - 15 10 35 60 85 output short voltage (mv) tem p ( c) vbat=2.7v vbat=3.6v vbat=5.5v 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 - 40 - 15 10 35 60 85 over voltage protect (mv) tem p ( c) vbat=2.7v vbat=3.6v vbat=5.5v downloaded from: http:///
datasheet datasheet 15/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vbat=3.6v vio=3.0v reset=2.5v 0.1 1 10 100 1 10 100 pwm duty (%) i led (ma) vbat=3.6v temp= 25c f_pwm= 10khz riset= 30k ? 0 1 2 3 4 5 6 7 8 9 10 0 2 04 06 08 01 0 0 pwm duty cy cle (%) i lmat (%) vbat=3.6v temp= 25c f_pwm= 10khz riset= 30k ? 0.1 1 10 100 1 10 100 pwm duty (%) i led (ma) vbat=3.6v temp= 25c f_pwm= 20khz riset= 30k ? 0 1 2 3 4 5 6 7 8 9 10 0 2 04 06 08 01 0 0 pwm duty cy cle (%) i lmat (%) vbat=3.6v temp= 25c f_pwm= 20khz riset= 30k ? figure 37. led current vs pwm duty (pwm output mode) figure 38. led current matching vs pwm duty (pwm output mode) figure 39. led current vs pwm duty (dc output mode) figure 40. led current matching vs pwm duty (dc output mode) downloaded from: http:///
datasheet datasheet 16/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and condition. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) figure 42. led current vs led current ratio figure 43. led current matching vs led current ratio figure 41. dnl vs led current ratio -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 0 64 128 192 256 code dnl (lsb) vbat=3.6v temp= 25c riset= 30k ? 0 5 10 15 20 25 0 64 128 192 256 code i led (ma) vbat=3.6v temp=25c riset=30k ? 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 64 128 192 256 code matching (%) vbat=3.6v temp=25c riset=30k ? downloaded from: http:///
datasheet datasheet 17/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued evaluation data is measured using below parts and conditon. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=3.0v reset=2.5v pwm=0v(gnd) 0 10 20 30 40 50 60 70 0 1 53 04 56 07 59 0 i iset (ua) i led (ma) temp=25c vio=3v reset= 2.5v vbat=2.7v vbat=5.5v vbat=3.6v 0 5 10 15 20 25 30 01 23 45 v led (v) i led (ma) temp= 25c vio=3v r_iset= 24k ? reset=2.5v vbat=2.7v vbat=5.5v vbat=3.6v 500 520 540 560 580 600 - 40 -15 10 35 60 85 temp ( c ) v iset (mv) vbat=2.7v vbat=3.6v vbat=5.5v figure 44. led current limit vs iset current figure 45. led current vs led voltage figure 46. iset voltage vs temperature downloaded from: http:///
datasheet datasheet 18/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 evaluation data -continued led current is measured using below parts. (unless otherwise specified) coil : 1277as-h-4r7m sbd : rb160va-40 vio=1.8v reset=2.5v pwm=0v(gnd) 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8 6 -40 - 15 10 35 60 85 temp ( c ) i led (ma) vbat=2.7v vbat=3.6v vbat=5.5v 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 -40 -15 10 35 60 85 temp (c ) i led (ma) vbat=2.7v vbat=3.6v vbat=5.5v 14 14.2 14.4 14.6 14.8 15 15.2 15.4 15.6 15.8 16 -40 -15 10 35 60 85 temp ( c ) i led (ma) vbat=2.7v vbat=3.6v vbat=5.5v figure 47. led current 5ma (rset=120k ? ) vs temperature figure 48. led current 10ma (rset=62k ? ) vs temperature figure 49. led current 15ma (rset=39k ? ) vs temperature figure 50. led current matching 15ma (rset=39k ? ) vs temperature 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 1. 8 2. 0 - 40 -15 10 35 60 85 led matching (%) temp ( c) vbat=2.7v vbat=3.6v vbat=5.5v downloaded from: http:///
datasheet datasheet 19/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 typical performance curves conditions: vbat=3.6v, ta=25c, fsw=0.6mhz, le d 6series x 1string and 2strings (1) fb=0.3v setting efficiency is calculated using the following equation: efficiency = (vout x led curr ent) / (vbat x input current) led current is calculated using the following equation: led current = max current x ratio x pwm duty where: max current is 12ma set by rset, which is the resistor connected to iset terminal. ratio is controlled by register (ad05h d[7:0]) pwm duty is equal to 100% (2) fb=0.5v setting efficiency is calculated using the following equation: efficiency = (vout x (led1+led2 current)) / (vbat x input current) led current is calculated using the following equation: led current = max current x ratio x pwm duty where: max current is 25ma set by rset, which is the resistor connected to iset terminal. ratio is controlled by register (ad05h d[7:0]) pwm duty is equal to100% 6series 1string efficiency (fb=0.3v) downloaded from: http:///
datasheet datasheet 20/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 control signal input timing timing sequence (vbat, vio, reset, i 2 c (sda, scl)) vbat voltage > vio voltage table 1. input timing symbol name unit min. typ. max. t1 power supply(ic) C power supply (io) time s 100 - - t2 power supply(io) C reset wait time s 0 - - t3 reset C i 2 c wait time s 100 - - t4 reset low width s 50 - - t5 reset - power supply(io) time s 0 - - t6 power supply(io) - power supply(ic) s 0 - - figure 51. timing diagram standby ic status operating (or standby) off off vio i 2 c if(sda, scl) reset t1 t3 t4 vbat t2 t5 t6 downloaded from: http:///
datasheet datasheet 21/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 serial interface it can interface with i 2 c bus format compatible. (1) slave address a7 a6 a5 a4 a3 a2 a1 r/w 1 1 0 0 1 0 0 1/0 figure 52. slave address (2) bit transfer scl transfers 1-bit data during each clock pulse and data is samp led at h state. sda cannot be changed at the time of bit transfer. any changes on the sda while scl is in h state, a st art condition or a stop condition will occur and it will be interpreted as a control signal. sd a scl sda line is stable data is valid change of data is allowed figure 53. bit transfer (i 2 c format) (3) start and stop condition when sda changes state while scl is h, data is not transferred on the i 2 c bus. two conditions might occur if this happens. if sda changes from h to l while scl is h, it will become start (s) condition which signals the beginning of a new command. if sda changes from l to h while scl is h, it will become stop (p) condition which signals the end of the previous command. sda scl s p start condition stop condition figure 54. start/stop condition (i 2 c format) (4) acknowledge transfer of 8-bit data occurs after each start condition. af ter eight bits had been sent, the transmitter opens sda while the receiver returns the acknowledge signal by setting sda to l. acknowledge is returned between address 00h and 0eh. 12 89 data output by transmitter(sda) data output by receiver(sda) acknowledge not acknowledge s start condition clock pulse for acknowledgement scl figure 55. acknowledge (i 2 c format) downloaded from: http:///
datasheet datasheet 22/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 (5) write protocol a register address is transferred by the next 1 byte that tr ansferred the slave address and the write-in command. the 3rd byte writes data in the internal register written in by the 2nd byte, and after the 4th byte or, the increment of register addr ess is carried out automatically. however, when a register address turns into the last address 0eh, it is set to 00h by the next transmission. after the transmission ends, the increment of the address is carried out. s a a a p register address slave address from master to slave from slave to master r/w=0(write) data a d7 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 0 x x x x x x x *1 *1 data a =acknowledge(sd a low) a =not acknowledge(sda high) s=start condition p=stop condition *1: write timing register address increment register address increment figure 56. writing protocol (6) read protocol it reads from the next byte after writing a slave address a nd r/w bit. the register to read is consider as the following address accessed at the end, and the data of the address that carried out the increment is read after it. if an address turns into the last address 0eh, the next byte will read out 00h. after the transmission end, the increment of the address is carried out. figure 57. reading protocol (7) multiple read protocol after specifying an internal address, it reads by repeated start condition and changing the data transfer direction. the data of the address that carried out the increment is read after it. if an address turns into the last address 0eh, the next by te will read out 00h. after the transmission end, the increment of the address is carried out. figure 58. multiple reading protocols as for read protocol and multiple read protocol, please do (not acknowledge) after doing the final reading operation. it stops with read when ending by a(acknowledge), and sda stops in the state of low when the reading data of that time is 0. however, this state returns usually when scl is moved, data is read, and (not acknowledge) is done. 1 s a p from master to slave from slave to master r/w=1(read) data a data slave address d7 d6 d5 d4 d3 d2 d1 d0 d7 d6 d5 d4 d3 d2 d1 d0 register address increment x x x x x x x a =acknowledge(sda low) a =not acknowledge(sda high) s=start condition p=stop condition register address increment a r/w=0(write) r/w =1(read) slave address register address slave address data data s a a a sr 1 0 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 x x x x x x x x x x x x x x a =acknowledge(sda low) a =not acknowledge(sda high) s=start condition p=stop condition from master to slave from slave to master register address increment register address increment p a d7 d6 d5 d4 d3d2 d1d0 d7 d6d5 d4 d3 d2 d1d0 a sr=repeated start condition downloaded from: http:///
datasheet datasheet 23/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 (8) timing diagram sda s cl t su;dat t low s sr p s t buf t hd;sta t su;sta t high t hd;sta t hd;dat t su;sto figure 59. timing diagram (i 2 c format) (9) electrical characteristics (unless otherwise specified, ta=25 o c, vbat=3.6v, vio=1.8v) table 2. electrical characteristics parameter symbol standard-mode fast-mode unit min. typ. max. min. typ. max. i 2 c bus format scl clock frequency f scl 0 - 100 0 - 400 khz low period of the scl clock t low 4.7 - - 1.3 - - s high period of the scl clock t high 4.0 - - 0.6 - - s hold time (repeated) start condition after this period, the first clock is generated t hd;sta 4.0 - - 0.6 - - s set-up time for a repeated start condition t su;sta 4.7 - - 0.6 - - s data hold time t hd;dat 0 - 3.45 0 - 0.9 s data set-up time t su;dat 250 - - 100 - - ns set-up time for stop condition t su;sto 4.0 - - 0.6 - - s bus free time between a stop and start condition t buf 4.7 - - 1.3 - - s downloaded from: http:///
datasheet datasheet 24/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 register list table 3. register list input "0 for "-". a free address has the possibility to assign it to the register for the test. access to the register for the test and the undefined register is prohibited. add ress r/w initial register data function d7 d6 d5 d4 d3 d2 d1 d0 00h w 00h - - - - - - - sfrst software reset 01h r/w 01h - - - ovp(1) ovp(0) - - rocp common setting1 02h r/w 02h skipen (1) skipen (0) swsrt (1) swsrt (0) - fosc fb(1) fb(0) common setting2 03h r/w 05h - - - - - led2 sel - led1 sel led channel select 04h r/w 00h - - - - - - - - dummy1 05h r/w ffh iled(7) iled(6) iled(5) iled(4) iled(3) iled(2) iled(1) iled(0) current ratio setting 06h r/w 00h - - - - - - - - dummy2 07h r/w 06h - - pwmen - - lpfen short - control setting 08h r/w 00h - - - - - srchg (2) srchg (1) srchg (0) slew rate changing setting 09h r/w 00h - - - - - - - - dummy3 0ah r/w 00h - - - - - - - - dummy4 0bh r/w 00h - - - - - - - - dummy5 0ch r/w 00h - - - - - - - - dummy6 0dh r/w 00h - - - - - - - - dummy7 0eh r/w 00h - - - - - - - pon enable setting downloaded from: http:///
datasheet datasheet 25/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 register map address 00h < software reset > address r/w d7 d6 d5 d4 d3 d2 d1 d0 00h w - - - - - - - sfrst initial value 00h - - - - - - - 0 d0: sftrst software reset 0: reset cancel 1: reset (initializes all registers) address 01h < common setting1> address r/w d7 d6 d5 d4 d3 d2 d1 d0 01h r/w - - - ovp(1) ovp(0) - - rocp initial value 01h 0 0 0 0 0 0 0 1 d[4:3]: ovp(1:0) over voltage protection detect voltage 00b: 23.5v (typ.) this setting is suitable for the parts of 25v absolute maximum ratings (initial value) 01b: 28.0v (typ.) this setting is suitable for the parts of 30v absolute maximum ratings 10b: 31.0v (typ.) this setting is suitable for the parts of 35v or 50v absolute maximum ratings 11b: 23.5v (typ.) this setting is suitable for the parts of 25v absolute maximum ratings d0: rocp over current protection level setting 0: 1.7a (typ.) 1: 1a (typ.) (initial value) address 02h < slew rate, fosc, feedback voltage > address r/w d7 d6 d5 d4 d3 d2 d1 d0 02h r/w skipen (1) skipen (0) swsrt (1) swsrt (0) - fosc fb(1) fb(0) initial value 02h 0 0 0 0 0 0 1 0 d[7:6]: skipen(1:0) pulse skip setting 00b: pulse skip all mode active (initial value) 01b: pulse skip mode1 disable (minimum duty fix mode) 10b: pulse skip mode2 disable (pulse stop mode) 11b: pulse skip all mode disable pulse skip all mode is min duty fix mode and pulse stop mode. pulse skip mode1 is min duty fix mode. pulse skip mode2 is pulse stop mode. d[5:4]: swsrt(1:0) control the rise and fall time of slew rate for sw terminal 00b: x1 (initial value) 01b: x0.8 (design concept) 10b: x0.6 (design concept) 11b: x0.4 (design concept) d2: fosc switching frequency value setting 0: 0.6mhz (initial value) 1: 1.1mhz d[1:0]: fb(1:0) feedback voltage setting 00b: 0.5v 01b: 0.4v 10b: 0.3v (initial value) 11b: 0.2v downloaded from: http:///
datasheet datasheet 26/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 address 03h < led channel select > address r/w d7 d6 d5 d4 d3 d2 d1 d0 03h r/w - - - - - led2 sel - led1 sel initial value 05h 0 0 0 0 0 1 0 1 d2: led2sel selection of the current driver and the protection for led2 0: unused led2 1: used led2 (initial value) d0: led1sel selection of the current driver and the protection for led1 0: unused led1 1: used led1 (initial value) when this address is selected to 00h, the selected current driver and protection turn off. (note:) set this address before setting address 0eh to 01h (power on). (note:) once setting ad0eh to 01h, this address (led channel select) is non-functional. setting led1 channel led2 channel comment reset reset terminal h to l software reset (ad00h data=01h) initial led1 = used led2 = used ad03h data=05h led1 = used led2 = unused ad03h data=01h power on ad0eh data=01h led1 = used led2 = unused ad03h data=04h led channel select is not changed power off ad0eh data=00h led1 = unused led2 = used ad03h data=04h led channel select is changed. power on ad0eh data=01h : select : unselect downloaded from: http:///
datasheet datasheet 27/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 address 05h < led current ratio setting > address r/w d7 d6 d5 d4 d3 d2 d1 d0 05h r/w iled(7) iled(6) iled(5) iled(4) iled(3) iled(2) iled(1) iled(0) initial value ffh 1 1 1 1 1 1 1 1 d[7:0]: iledx(7:0) led current setting this address determines the ratio of the operating led current with respect to the maximum led current set by rset. the ratio can be varied from 1/256 to 256/256. data 00h ratio = 00 (0+1)/256 = 00 1/256 = 0.39% data 20h ratio = 0 (32+1)/256 = 0 33/256 = 12.89% data c7h ratio = (199+1)/256 = 200/256 = 78.13% data ffh ratio = (255+1)/256 = 256/256 = 100% led current = max current x ratio x pwm duty (from pwm terminal) = imax x (iled +1) / 256 x pwm duty where: imax is set by rset, which is the resistor connected to iset terminal (see led current setting at p.34). address 07h address r/w d7 d6 d5 d4 d3 d2 d1 d0 07h r/w - - pwmen - - lpfen short - initial value 06h 0 0 0 0 0 1 1 0 d5: pwmen pwm enable control (valid/invalid) 0: pwm input is invalid, h fixed (initial value) 1: pwm input is valid d2: lpfen low pass filter for current driver 0: low pass filter isnt used 1: low pass filter is used (initial value) pwm dimming condition on pwmen and lpfen setting pwmen lpfen led current 0 0 dc ( 8bit dac ) 0 1 dc ( 8bit dac ) 1 0 pwm ( 8bit dac and pwm duty ) 1 1 dc ( 8bit dac and pwm duty ) d1: short led short protection setting 0: short protection is invalid 1: 5.4v (initial value) fi g ure 60. pwmen settin g h l pwmen=1, lpfen=0 pwm led current h pwmen=0, lpfen=0 pwm led current downloaded from: http:///
datasheet datasheet 28/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 address 08h address r/w d7 d6 d5 d4 d3 d2 d1 d0 08h r/w - - - - - srchg (2) srchg (1) srchg (0) initial value 00h 0 0 0 0 0 0 0 0 d[2:0]: srchg(2:0) slew rate change setting 000b: keep the slew rate selected at ad02h d[5:4] (initial value) 001b: repeat x0.4 x0.6 x0.8 x1.0 x0.8 x0.6 010b: repeat x0.4 x0.6 x0.8 x0.6 011b: repeat x0.4 x0.6 100b: repeat x0.8 x1.0 101b,110b,111b: repeat x0.6 x0.8 address 0eh address r/w d7 d6 d5 d4 d3 d2 d1 d0 0eh r/w - - - - - - - pon initial value 00h 0 0 0 0 0 0 0 0 d0: pon power control for all blocks 0: power off (initial value) 1: power on downloaded from: http:///
datasheet datasheet 29/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 functional descriptions 1) reset there are two kinds of reset, software reset and hardware reset. software reset all the registers are initialized by sftrst = 1. sftrst is an automatically returned to 0. (auto return 0) hardware reset it shifts to hardware reset by changing reset pin h l. the condition of all the registers under hardware reset pin is returned to the initial value, and it stops accepting all addres s. to release from a state of hardware reset, change reset pin l h. reset sequence when hardware reset was done during software reset, software reset is canceled when hardware reset is canceled. (because the initial value of software reset is 0) 2) pulse skip control this ic regulates the output voltage using an improved pulse-skip. in pulse-skip mode, the error amplifier disables the oscillator causing the switching of the power stages to stop when low output voltage and high input voltage are detected. the said switching cycle will be reactivated when the ic detects low input voltage. at light loads, a conventional pulse-skip regulation mode is used. the pulse-skip regulation minimizes the operating current because this ic does not switch continuously and hence the losses of the switching are reduced. when the error amplifier disables switching, the load is also isolated from the input. this improved pulse-skip control is also referred t o as active-cycle control. pulse skip setting can be controlled in four (4) different modes by register (skipen:(ad02h d[7:6])). figure 61. pulse-skip 3) soft start bd65b60 has a soft start function which prevents large coil current from flowing to the ic. during start-up, in-rush current is prevented. the soft start of this ic controls t he over-current setting hence peak current is controlled. after changing enable register (pon:(ad0eh d0)) from l to h, soft start takes place within the period of 1.8ms (typ.) once soft start is finished, boost condition change to normal state. figure 62. soft start vout terminal led current sw terminal keep current setting reset boost condition i 2 c if (sda, scl) pulse-skip 1.8ms off soft start on on off(or on) finish all setting start boost vio c oil current off normal state vout vbat pon (ad0eh d0) off on off on soft start pwm off t1 t2 soft start time=t1+t2=1.8ms switching duty [%] skipen(1:0)=00b skipen(1:0)=01b skipen(1:0)=10b skipen(1:0)=11b output current normal normal normal normal minimum duty fix minimum duty fix minimum duty pulse stop pulse stop minimum duty fix minimum duty pulse stop downloaded from: http:///
datasheet datasheet 30/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 protection protection table no failure mode detection mode led current dc/dc feedback dc/dc action after release failure 1 led1 is used led2 is used led short ( led1 is short ) led1 > 5.4v(typ.) led2 < 0.9v(typ.) vsc = 5.4v(typ.) stop active feedback cut feedback active normal output latch 2 led1 is used led2 is used led short ( both led1 and led2 are short ) led1 > 5.4v(typ.) led2 > 5.4v(typ.) vsc = 5.4v(typ.) active feedback active normal output auto return 3 led1 is used led2 is used led short ( both led1 and led2 are short ) led1 < 5.4v(typ.) led2 < 5.4v(typ.) vsc = 5.4v(typ.) active feedback active normal output auto return 4 led1 is used led2 is unused led short ( led1 is short ) led1 > 5.4v(typ.) vsc = 5.4v(typ.) active feedback active normal output auto return 5 led1 is used led2 is unused led short ( led1 is short ) led1 < 5.4v(typ.) vsc = 5.4v(typ.) active feedback active normal output auto return 6 led open ( led1 is open ) vout > ovp setting led2 < 5.4v(typ.) vsc = 5.4v(typ.) dont flow active feedback active feedback active ovp action auto return 7 led open ( led1 is open ) vout > ovp setting led2 > 5.4v(typ.) vsc = 5.4v(typ.) dont flow dont flow feedback active feedback active led short action latch 8 led open ( both led1 and led2 are open ) vout >ovp setting dont flow active ovp action auto return 9 vout/sw short to gnd vout < 0.2v dont flow active stop auto return 10 led vf more than ovp setting vout > ovp setting stop active ovp action auto return 11 sw current too high sw current > ocp active active ocp action auto return 12 temperature > tsd(175 c) stop active stop auto return condition: normal state (this state isnt soft start) the latch is released by (1) input hardware reset signal to reset terminal (2) input the register of software reset by i2c (3) detect uvlo please refer to application deficiency operation regarding these functions. downloaded from: http:///
datasheet datasheet 31/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 ? over voltage protection (ovp) when led is disconnected, it will result to open dc/dc out put causing it to over step-up. when vout pin exceeds the absolute maximum rating, the switch n-channel transistor and ic will break down. to prevent this, the over-voltage limit is activated when vout pin becomes equal or more than the detect voltage thus turning off the switching and stopping the operation of the dc/dc. after over voltage protection, as shown in figure 63, the ic changes from active into non-active, and the output voltage goes down slowly. figure 63. ovp operating description ? over current protection over current flows in current detect resistor that is c onnected between internal switching tr source and gnd. when it increases beyond the detect voltage, over current protect oper ates. over current protect prevents the increase of more than the detect voltage by reducing the on duty of switching tr without stopping boosting operation. since the over current detector of this ic detects peak curre nt, over current does not flow more than the set value. ? external sbd open detect / output short protection if in case external sbd and dc/dc output (vout) connections are opened or vout is shorted to gnd, there is a risk that the coil and the internal tr may be destroyed. external sbd open and output short protection activate when vout becomes 200mv(typ.) or below causing the output tr to turn off and preventing the destruction of the coil and the ic. no current will flow (0ma) since the ic changes from active into non-active. ? thermal shut down this ic has thermal shut down function. the thermal shut down works at 175 ? c (typ.) or higher, and the ic changes from active into non-active. ? low voltage detect protection (uvlo) when supply voltage (vbat) becomes lower than the detect voltage 2.1v(typ.), dc/dc converter and constant current driver are disabled. moreover, this function can be turned off by boosting supply voltage up to more than hysteresis voltage. dc/dc current driver vbat reset 2.1 v 10% a ctive a ctive 2.3 v figure 64. uvlo protection vout(output voltage) led1 voltage led1 connection led2 connection feedback reset normal led2 led1 normal open led1 current 25ma 0ma led2 current 25ma 0ma hysteresis (1v typ.) ovp C ovp hys ovp downloaded from: http:///
datasheet datasheet 32/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 application deficiency operation (1) when 1 led or 1string is open during the operation the led string, which become open will not light (e.g. led1) but the other led string will continue its operation. as shown in figure 65, led1 voltage becomes 0v when ch annel led1 is opened. this voltage which is below 0.3v (typ.) will then be detected as its lowest feedback voltage causing the output voltage to boost up to its over voltage protection limits. . (2) when led short-circuited in multiple all led strings are lighted unless led1 and led2 terminal voltage is more than 5.4v(typ.)(short:(ad02h d0)=1). only the string that is short-circuited becomes more than 5.4v(typ.) will be turned off while the other led string continues to turn on normally. as shown in figure 66, led1 current (shorted line) is c hanged from 25ma(typ.) to 0ma(typ.), so led1 terminal doesnt generate heat. (3) when schottky diode (sbd) remove in the situation where the sbd connection is opened while dc/dc is still activated, sw terminal voltage becomes more than the rated voltage due to lack of parts that can accept the current accumulated inside the coil. consequently, ic might be destroyed. to prevent the ic destruction, sbd ope n protection is operated. the sw terminal will not be damaged because boost operation will be stopped when vout terminal detects less than 0.2v. figure 65. led open protect figure 66. led short protect led1terminal feedbac k led1 curren t led1 led2 led2 curren t 20ma(typ.) 20ma(typ.) 0ma(typ.) vout terminal 0.3v(typ.) led short led2terminal 0.3v(typ.) 5.4v(typ.) led1>led2 120 s(typ.) led1 led2 led1 led2 vout(output voltage) led1 voltage led1 connection led2 connection feedback reset normal led2 led1 normal open led1 current 25ma 0ma led2 current 25ma 0ma hysteresis (1v typ.) ovp C ovp hys ovp downloaded from: http:///
datasheet datasheet 33/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 selecting the number of operational led channels the number of operational led channels is chosen by modifying d2 and d0 of the register address 03h. in the example as shown in figure67, only led1 channel is active (ad03h, data=01h). figure 67. led selection register is set for open strings vout terminal led1 terminal led2 terminal normal voltage 0.3v(typ.) 0v(typ.) 0v(typ.) i 2 c if(sda,scl) reset terminal reset led sel register 01h 05h 05h led1 led2 open downloaded from: http:///
datasheet datasheet 34/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 led current setting led current is set by register (ad05h d[7:0]) and rset resistor which is computed in the following equation: led current = max current x ratio x pwm duty (from pwm terminal) = imax x (iled +1) / 256 x pwm duty where: imax = this is set by the resistor (rset) connected to iset terminal and computed in the following equation: imax current = 600 / rset (a) imax setting example rset imax 24k ? 25.0ma 30k ? 20.0ma 56k ? 10.7ma 120k ? 5.0ma ratio = this is given by varying ad05h d[7:0] data 00h ratio = 00 (0+1)/256 = 00 1/256 = 00 0.39% data 20h ratio = 0 (32+1)/256 = 0 33/256 = 0 12.89% data c7h ratio = (199+1)/256 = 200/256 = 0 78.13% data ffh ratio = (255+1)/256 = 256/256 = 100.00% pwm duty = pwm h duty of pwm pulse. pwm pulse is inputted from pwm terminal. feedback voltage setting feedback voltage is set by register (ad02h d[1:0]). to improve the efficiency, low feedback voltage which is determined by the led current and output voltage (vout) ripple should be set. to maintain a vout ripple below 50mv, the recommended feedback voltages for each led current range are shown below: feedback voltage feedback voltage imax 0.5v all range 0.4v under 23.0ma 0.3v under 15.3ma 0.2v under 7.6ma downloaded from: http:///
datasheet datasheet 35/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 brightness control this ic has several methods of brightness controls such as: maximum current set by rset resistor connected at iset terminal; current ratio set by 8bit dac and pwm control which can be set as dc or pulse input. when pwmen=1 by (ad07h d5), pwm pulse can be inputted and vice versa when pwmen = 0. when lpfen=0 by (ad07h d2), the capacitor of lpf is disconnected. led current is as same as pwm pulse. when lpfen=1, the capacitor of lpf is connected. led current becomes dc. (1)dc dimming controlled by 8bit current dac, as shown in figure 68. this dimming is controlled by 8bit current dac controlled by current ratio register (ad05h). the led current becomes dc, because pwm input is not accepted by pwmen=0. setting current is shown as below. led current = max. current x ratio = imax x (iled +1) / 256 (2)pwm dimming controlled by 8bit current dac and pwm duty for cabc, as shown in figure 70. this dimming is controlled by 8bit current dac and pwm pulse inputted to pwm terminal. main brightness is controlled by 8bit current dac and the dimming according to contents like movie and picture is controlled by pwm. led current flows with the h section of pwm, and does not flow with the l section. therefore, the average led current increases in proportion to duty cycle of pwm signal. because it becomes to switch the driver, the current tolerance is low when the pwm brightness is adjusted making it possible to control the brightness until 5 s (min.10% at 20khz). and, do not use for the brightness control, because effect of iset changeover is big under 5 s on time and under 5 s off time. setting current is shown as below. led current = max. current x ratio x pwm duty (from pwm terminal) = imax x (iled +1) / 256 x pwm duty (3)dc dimming controlled by 8bit current dac and pwm duty for cabc, as shown in figure 69. this dimming is controlled by 8bit current dac and pwm pulse inputted to pwm terminal. main brightness is controlled by 8bit current dac and the dimming according to contents like movie and picture is controlled by pwm. by lpf, pwm pulse becomes average into bd65b60, according to the duty of pwm pulse. therefore, the average led current increases in propor tion to duty cycle of pwm signal. because led current becomes dc, coil current also becomes dc. the noise of this dimming is smaller than that of pwm dimming, but the current tolerance is worse than pwm dimming. pwm dimming range is from 10% to 100%. if duty changes under 10%, led current tolerance become big. typi cal pwm frequency is 20khz to 100khz. setting current is shown as below. led current = max. current x ratio x pwm duty (from pwm terminal) = imax x (iled +1) / 256 x pwm duty no. pwmen lpfen led current (1) 0 0 dc ( 8bit dac ) 0 1 dc ( 8bit dac ) (2) 1 0 pwm ( 8bit dac and pwm duty ) (3) 1 1 dc ( 8bit dac and pwm duty ) pwm led current coil current ics active current on off on off on off on figure 70. pwm dimming pwm led current coil current ics active current on off on dc dc figure 69. dc dimming pwm current ratio setting 8bit dac pwmen lpfen led1 led2 iset driver + - iset rset current driver + - current driver + - figure 68. brightness control downloaded from: http:///
datasheet datasheet 36/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 coil selection the dc/dc is designed using a coil value equal or greater than 4.7h. sub-harmonic oscilla tion of current mode dc / dc might happen if the coil l value used is equal or lower than 2.2h. when the coil l value increases, the phase margin of dc / dc becomes zero therefore, output capacitor value should also be increased. make the resistor component smaller in order to increase the efficiency of dcr inductor. estimation of coil peak current is shown at the examples below. peak current calculation as over current detector of this ic is detected the peak curren t, it have to estimate peak current to flow to the coil by operating condition. in case of, - supply voltage of coil = v in - inductance value of coil = l - switching frequency = fsw - output voltage = v out - total led current = i led - average current of coil = iave - peak current of coil = ipeak - cycle of switching = t - efficiency = eff (please set up having margin) - on time of switching transistor = ton - on duty = d the relation is shown below: ccm: ipeak = (v in / l) (1 / fsw) (1-(v in / v out )), dcm: ipeak = (v in / l) ton iave = (v out iout / v in ) / eff ton = (iave (1- v in / v out ) (1 / fsw) (l / v in ) 2) 1/2 each current is calculated. as peak current varies according to whether there is the direct current superposed, the next is decided. ccm: (1- v in / v out ) (1 / fsw) < ton ? peak current = ipeak /2 + iave dcm: (1- v in / v out ) (1 / fsw) > ton ? peak current = v in / l ton (example 1) in case of, v in =3.6v, l=10h, fsw=0.6mhz, v out =26.4v, i led =50ma, efficiency=88% iave = (26.4v 50ma / 3.6v) / 88% = 0.4167a ton = (0.4167a (1 - 3.6v / 26.4v) (1 / 0.6mhz) (10h / 3.6v) 2) 1/2 = 1.825s (1- v in / v out ) (1 / fsw) =1.439s < ton(1.825s) ccm ipeak = (3.6v / 10h) (1 / 0.6mhz) (1 - (3.6v / 26.4v)) = 0.5182a peak current = 0.5182a / 2 + 0.4167a = 0.6758a (example 2) in case of, v in =3.6v, l=10h, fsw=0.6mhz, v out =19.8v, i led =11.3ma, efficiency=88% iave = (19.8v 11.3ma / 3.6v) / 88% = 0.0706a ton = (0.0706a (1 - 3.6v/ 19.8v) (1 / 0.6mhz) (10h / 3.6v) 2) 1/2 = 0.731s (1- v in / v out ) (1 / fsw) =1.364s > ton(0.731s) dcm ipeak = v in / l x ton = 3.6v / 10h x 0.731s = 0.2633a peak current = 0.2633a dcm/ccm calculation discontinuous condition mode (dcm) and continuous condition mode (ccm) are calculated as following. ccm: l > v out d (1 - d) 2 t / (2 i led ) dcm: l < v out d (1 - d) 2 t / (2 i led ) *d = 1- v in / v out (example 1) in case of, v in =3.6v, l=10h, fsw=0.6mhz, v out =26.4v, i led =50ma v out d (1 - d) 2 t / (2 i led ) = 26.4v (1C3.6v/26.4v) (3.6v/26.4v) 2 1/(0.610 6 hz) / (20.05a) =7.066h < l(10h) ? ccm (example 2) in case of, v in =3.6v, l=10h, fsw=0.6mhz, v out =19.8v, i led =11.3ma v out d (1 - d) 2 t / (2 i led ) = 19.8v (1C3.6v/19.8v) (3.6v/19.8v) 2 1/(0.610 6 hz) / (20.0113a) =39.494h > l(10h) ? dcm downloaded from: http:///
datasheet datasheet 37/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 output capacitor selection output capacitor smoothly keeps output voltage and supplies led current. output voltage consists of charge (fet on) and discharge (led current). so output voltage has output ripple voltage in every fet switching. select a capacitor value which allows the output ripple voltage to settle within 50mv. output ripple voltage is calculated as follows. output ripple voltage - switching cycle = t - total led current = i led - switching on duty = d - output ripple voltage = v ripple - output capacitor = c out - output capacitor (real value) = c real - decreasing ratio of capacitor = c error - supply voltage of coil = v in c real = c out c error (capacitor value is decreased by bias) c real = i led (1-d) t / v ripple c out = i led (1-d) t / v ripple / c error (example 1) in case of, v in =3.6v, fsw=0.6mhz, v out =19.8v, i led =15ma, c out =1.0f, c error =50% t = 1 / 0.6mhz d = 1 C v in / v out = 1 C 3.6v/19.8v = 0.818 v ripple = i led (1-d) t / (c out c error ) = 15ma (3.6v/19.8v) (1/0.6mhz) / (1.0f0.5) = 9.1mv input capacitor selection 1 f ceramic capacitor with 10v (greater than coil voltage) is recommended for the inductor. schottky diode selection shottky diode should be used for boost. maximum peak current s hould be greater than inductor peak current (1a(typ.) or 1.7a(typ.)) to ensure reliable operation. average current should be greater than the maximum output current. schottky diodes with a low forward drop and fast switching speeds are ideal for increasing efficiency in portable applications. ch oose a reverse break down voltage of the schottky diode significantly larger than the output voltage. led selection please select led vf that input voltage is smaller than output voltage (vout). and also select led vf that output voltage is smaller than ovp voltage -1v. sda, scl pull-up resistor selection please select the most suitable pull-up resistor value to input i2c frequency. the case pull-up resistor value is too big, scl and sda pulse are rounded. therefore high speed transfer is impossible. 0v 35v 50v output voltage capa [f] c out c real figure 71. bias characteristics of capacitor downloaded from: http:///
datasheet datasheet 38/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 ic and coil power supply separation bd65b60 can operate in a separate power source for the ic and coil. with this application, ic power consumption is decreased and the applied voltage can be exceeded the ic rating of 5.5v. figure 72 shows the separate power sources for coil and ic wherein the coil power supply is connected to a high voltage source applied from adapters. figure 72. separate power supply application 2.7v to 5.5v cout cvbatl controller vbat reset sw led1 led2 vout pwmin scl sda vio 1.65v to 3.3v gnd rset iset pwm 10 h BD65B60GWL cvbat 7v cvio downloaded from: http:///
datasheet datasheet 39/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 pcb layout pcb layout is very important to achieve the best performance of the ic. layout pattern can greatly affect some characteristics of the ic, such as efficiency and ripple. figure 73. schematic connect input bypass capacitor cvbat (1.0 f(typ.)) as close as possible to coil and gnd pin. connect input bypass capacitor cvio (0.1 f(typ.)) as close as possible to vio pin and gnd pin. connect coil as close as possible to sw pin. when the dist ance between coil and sw pin is long, the efficiency becomes incorrect due to the effect of pcb parasitic capacitance. connect schottky barrier diode sbd as close as possible between coil and sw pin. connect output capacitor cout between cathode of sbd and gnd. make both gnd sides of cvbat and cout as close as possible. connect the current setting resistor rset near the iset and gnd pins. when these pins are not directly connected near the chip, the performance of bd65b60 may be affected and it may limit the current drive. as for the wire of the inductor, make sure that its resistance is small enough to reduce the electric power consumption and to increase the entire efficiency. do not connect capacitor between iset and gnd pin. 2.7v to 5.5v 2.2 f 1 f 10 h vbat tsd reset uvlo fault detector sw output over voltage protect led terminal short detector led return select led1 led2 vout + - current sense over current protect control sense osc + erramp pwm comp 2ch current driver + - pwmin scl sda logic vio 8bit dac 1.1 or 0.6mhz reset i2c soft start ref x1, x0.8, x0.6, x0.4 vshort=no, 5.4v gnd pre-driver current ratio setting fb voltage setting 31v/28v 23.5v iset driver + - rset ise t pwm cout cvbat (cvio) output short protect 3v controller sbd downloaded from: http:///
datasheet datasheet 40/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 recommended layout pattern figure 74. top copper trace layer figure 75. bottom copper trace layer rreset vbatl gnd gnd vbat vout led2 led1 vio scl sda pwm reset cvbat1 cout2 cout1 cvbatl coil sbd rset1 rset2 rscl rsda cvio BD65B60GWL downloaded from: http:///
datasheet datasheet 41/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 selection of external parts recommended external parts are shown below. if there are parts that will be used and not listed below, make sure to choose the equivalent parts. ? coil value manufacturer product number size (mm) dc current (ma) dcr ( ? ) vertical horizontal height (max) 10h tdk vlf302512mt-100m 3.0 2.5 1.2 690 0.25 10h tdk vlf403212mt-100m 4.0 3.2 1.2 1000 0.23 10h tdk vlf302510mt-100m 3.0 2.5 1.0 650 0.31 10h tdk vlf403210mt-100m 4.0 3.2 1.0 780 0.26 10h toko dem3532c series 1229as-h-100m 3.5 3.7 1.2 750 0.24 4.7 h toko dfe322512c series 1277as-h-4r7m 3.2 2.5 1.2 1800 0.17 4.7 h toko dfe252012c series 1239as-h-4r7m 2.5 2.0 1.2 1500 0.24 10 h toko dfe252012c series 1239as-h-100m 2.5 2.0 1.2 1000 0.46 4.7 h toko dfe322510c series 1276as-h-4r7m 3.2 2.5 1.0 1400 0.22 10 h toko dfe322510c series 1276as-h-100m 3.2 2.5 1.0 900 0.49 ? capacitor value pressure manufacturer product number size (mm) vertical horizontal height 2.2f 50v murata grm31cb31h225k 3.2 1.6 1.6 1.0f 50v murata grm31mb31h105k 3.2 1.6 1.15 1.0f 50v murata grm188b31h105k 1.6 0.8 0.8 4.7 f 25v murata grm319r61e475k 3.2 1.6 0.85 2.2 f 25v murata grm219b31e225k 2.0 1.25 0.85 1.0f 25v murata grm188b31e105k 1.6 0.8 0.8 4.7 f 10v murata grm219b31a475k 2.0 1.25 0.85 2.2f 10v murata grm188b31a225k 1.6 0.8 0.8 1.0f 10v murata grm188b11a105k 1.6 0.8 0.8 ? sbd pressure manufacturer product number size (mm) io recommended the number of leds vertical horizontal height 30v rohm rb521sm-30 1.6 0.8 0.6 0.2a 7series 1string 30v rohm rb550ss-30 1.6 0.8 0.6 0.5a 7series 2strings 30v rohm rb550va-30 2.5 1.3 0.6 1.0a 7series 2strings 40v rohm rb521sm-40 1.6 0.8 0.6 0.2a 8series 1string 40v rohm rb160ss-40 1.6 0.8 0.6 1.0a 8series 2strings 40v rohm rb160va-40 2.5 1.3 0.6 1.0a 8series 2strings the coil is the most influential part to efficiency. select a coil which has an excellent direct current resistor (dcr) and current-inductance characteristic. bd65b60 ic is designed for an inductance value of 4.7h to 10h. do not use inductance values less than 2.2h. select a ceramic capacitor type with excellent frequency and temperature characteristics. furthermore, select a capacitor with small direct current resistance and pay sufficient attention to the layout pattern. downloaded from: http:///
datasheet datasheet 42/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 application example figure 76 and figure 77 are application examples. figure 76. application example (6 series x 1 string) figure 77. application example (8 series x 2 strings) 2.7v to 5.5v cvbatl ( 2.2 f/10v ) controller vbat reset sw led1 led2 vout pwmin scl sda vio 1.65v to 3.3v gnd rset iset pwm 10 h BD65B60GWL cvbat ( 1 f/10v ) cvio ( 0.1 f/10v ) cout ( 2.2 f/50v ) 2.7v to 5.5v controller vbat reset sw led1 led2 vout pwmin scl sda vio 1.65v to 3.3v gnd rset iset pwm 4.7 h BD65B60GWL cout (2.2 f/50v) x 2 cvbat (1uf/10v) cvbatl (2.2uf/10v) cvio (0.1uf/10v) downloaded from: http:///
datasheet datasheet 43/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 attention point of board layout in board pattern design, power supply line should be low impedance, especially around dc/dc converter. insert a bypass capacitor if necessary. about heat loss in heat design, operate the dc/dc converter in the following condition. (the following temperature is a guarantee te mperature, so consider the margin.) 1. ambient temperature ta must be less than 85c. 2. the loss of ic must be less than dissipation pd. cautions on use (1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply voltage (vbat), temperature range of operating conditions (topr), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) operating conditions these conditions represent a range within which characteristi cs can be provided approximately as expected. the electrical characteristics are guaranteed under the conditions of each parameter. (3) reverse connection of power supply connector the reverse connection of power supply connector can break do wn ics. take protective measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the ics power supply terminal. (4) power supply line design pcb pattern to provide low impedance for the wiring between the power supply and the gnd lines. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd termina l. at the same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurr ence of capacity dropout at a low temperature, thus determining the constant. (5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintain ed at the minimum in any operating state. furthermore, check to be sure no terminals are at a potential lower than the gnd voltage including an actual electric transient. (6) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the gnd terminal, the ics can break down. (7) operation in strong electromagnetic field be noted that using ics in the strong electromagnetic field can malfunction them. downloaded from: http:///
datasheet datasheet 44/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connected to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each process. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to turn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to turn off the power supply and then dismount it from the jig. in addition, fo r protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set pcb. (9) input terminals in terms of the construction of ic, parasitic elements are inevitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a voltage lower than the gnd respectively, so that any parasitic element will operate. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a single ground at the reference point of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a degradation in the nominal capacitance due to dc bias and changes in the capacitance due to temperature, etc. (12) thermal shutdown circuit (tsd) when junction temperatures become 175c (typ.) or higher, t he thermal shutdown circuit operates and turns a switch off. the thermal shutdown circuit, which is aimed at isolating the lsi from thermal runaway as much as possible, is not aimed at the protection or guarantee of the lsi. therefore, do not c ontinuously use the lsi with this circuit operating or use the lsi assuming its operation. (13) thermal design perform thermal design in which there are adequate margins by taking into account the permissible dissipation (pd) in actual states of use. (14) selection of coil select the low dcr inductors to decrease power loss for dc/dc converter. downloaded from: http:///
datasheet datasheet 45/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 ordering information b d 6 5 b 6 0 g w l e 2 part number package gwl: ucsp50l1 packaging and forming specification e2: embossed tape and reel marking diagram part number marking lot number 1pin mark 5 b 6 0 ucsp50l1 (top view) downloaded from: http:///
datasheet datasheet 46/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 physical dimension tape and reel information package name ucsp50l1(BD65B60GWL) downloaded from: http:///
datasheet datasheet 47/47 tsz02201-0g3g0c210420-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 15 ? 001 BD65B60GWL 3.jun.2013 rev.001 revision history date revision changes 3.jun.2013 001 new release downloaded from: http:///
datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hms products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohms products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohms internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice C we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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