2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 1 GR8030 features linear fan speed controller wide fan speed control range programmable anti-lock start up timer programmable minimum fan speed adjustable fan speed curve slope programmable knee point and otp point otp protection with fault output ntc thermistor open full speed operation sot-26 package applications lcd tv power supply game machine power supply industrial or medical power supply pc power supply server power supply description the GR8030 is designed for programming the curve of dc fan speed versus temperature via a ntc thermistor and few counts of passive components. the speed curve includes anti-lock with full speed operation time, minimum fan speed when at idle state, a knee point where fan speed starts to accelerate when temperature over the set point, a programmable slope of fan speed versus temperature, and otp (over-temperature protection) trig point. the GR8030 sends a low level on fsc pin when the otp pin is lower than the set point of temperature protection level. it is also built-in t he ntc thermister open with full speed operation function. ordering and marking information sot-26 code 1 8 9 a b g h i j year 2008 2009 2010 2011 2016 2017 2018 2019 code 2 1 2 3 4 9 a b c month jan. feb. mar. apr. sep. oct. nov. dec. grenergy opto inc. reserves the right to make change s to improve reliability or manufacture ability wit hout notice, and advise customers to obtain the latest version of re levant information to verify before placing orders. linear fan speed controller with otp function
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 2 GR8030 pin configuration top view pin description pin no. symbol description 1 drv drive external bjt base 2 gnd ground 3 vth temperature sensor (ntc thermistor ) input 4 otp over-temperature trip point 5 fsc set minimum fan speed; output of otp flag 6 vcc power supply absolute maximum ratings supply voltage vcc ------------------------------ --------------------------------------------------- ---------------------- +20v drv, vth, vfsc, otp ------------------------------- --------------------------------------------------- ---- -0.3 ~ vcc+0.3v junction temperature ----------------------------- --------------------------------------------------- --------------------- 150 operating ambient temperature -------------------- --------------------------------------------------- ------- -20 ~ 85 storage temperature range ------------------------ --------------------------------------------------- ------- -65 ~ 150 sot-26 package thermal resistance ---------------- --------------------------------------------------- ----------- 250 /w power dissipation (sot-26, at ambient temperature = 85 ) ------------------------------------------------ 250mw lead temperature (all pb free packages, soldering, 10 sec) ------------------------------------------ -------- 260 esd voltage protection, human body model --------- --------------------------------------------------- -------------- 2kv esd voltage protection, machine model ------------ --------------------------------------------------- --------------- 200v
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 3 GR8030 block diagram electrical characteristics (vcc = 12v and t a = 25 , unless otherwise specified) parameter conditions symbol min. typ. max. unit operating voltage vcc 10 17 v operating current drv pin open i cc 200 300 a start up voltage v st 5 v otp detect voltage divider factor v otp_in = v cc /k otp_in k otp_in 2.92 2.96 3.00 otp release voltage divider factor v otp_out = v cc /k otp_out k otp_out 2.56 2.62 2.67 otp detect voltage hysteresis vcc = 12v v otp_hs 500 mv vcc = 17v 710 mv ntc open full speed operation (otp pin trig point) vcc=12v 10.9 11.7 v otp pull low resistance r otp 2.1 3 3.9 k output clamping voltage vcc = 17v v clamp 12 14 16 v vth fsc vcc gnd v ref drv otp driver 100k driver otp 5k 15k fs 18k v fs
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 4 GR8030 typical application circuit typical fan speed curve fan speed min fan speed 30 60 85 10% 60% 80% start up temperature increase 115 otp knee point max fan speed slope
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 5 GR8030 application information minimum fan speed the fsc pin is used to set the minimum output voltage of drv pin (set the idle speed of fan). the level is decided by a voltage divider. vcc r r r v 3 2 3 fsc + = knee point the dc fan begins to speed up at a specific temperature named knee point. the knee point can be changed by the resistors r5 and r6 in series with the ntc. r5 and r6 can be decided by below formula. ) _ ( 6 5 knee t r v v vcc r r ntc fsc fsc ? = + where r ntc (t_knee) is the resistance at knee point you set. a user can find the value from thermistor datasheet. the slope of speed v.s. temperature by adjusting r 4 , the ic can provide different slope of the fan speed versus temperature curve. r ntc is an approximated value during the slope range. maximum fan speed the drv pin will pull high to 12v for maximum fan speed in 12v system. however, in 17v system, the drv pin will be clamped at 14v for maximum fan speed limitation and protect fan from damaged. anti-lock start up timer at start-up period, the drv pin will output 12v. it drives the fan with maximum speed for a set period of time then drops to minimum voltage. the period could be changed with different time constant =c 1 *(r 2 //r 3 ). the period of time is about 1.5 for 12v supply voltage and 2 for 17v supply voltage. over-temperature protection when the voltage of otp pin is lower than the vref, the drv pin will output 12v to drive fan as maximum fan speed and the fsc pin will be pulled to low. where vref = vcc*k otpin . once the ntc thermister is opened in accidently, the drv pin als o outputs the high to fully drive the fan. in such situation, the voltage on otp pin will higher enoug h to trig the ntc open comparator trip point 10.9v in minimum. the designer should take care the r5, r6 and ntc thermister value at lower temperature. while at lower temperature, the otp pin may be higher than ntc open trip point. the designer should be sure the voltage on otp pin is lower than 10.9v at lower temperature. or the designer does not need the ntc open protection function, that could parallel one 8~9v zener diode on otp pin to disable the function as shown in below figure. .
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 6 GR8030 package information symbol sot-26 millimeters inches min. max. min. max. a 1.45 0.057 a1 0.00 0.15 0.000 0.006 a2 0.90 1.30 0.035 0.051 b 0.30 0.50 0.012 0.020 c 0.08 0.22 0.003 0.009 d 2.70 3.10 0.106 0.122 e 2.60 3.00 0.102 0.118 e1 1.40 1.80 0.055 0.071 e 0.95 bsc 0.037 bsc e1 1.90 bsc 0.075 bsc l 0.30 0.60 0.012 0.024 0 o 8 o 0 o 8 o note : 1. followed from jedec to-178 ab. 2. dimension d and e1 do not include mold flash, pr otrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 10 mil per side.
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 7 GR8030 carrier tape & reel dimensions sot-26 application a h t1 c d d w e1 f sot-26 178.02.00 50 min. 8.4+2.00 -0.00 13.0+0.50 -0.20 1.5 min. 20.2 min. 8.00.30 1.750.10 3.50.05 p0 p1 p2 d0 d1 t a0 b0 k0 4.00.10 4.00.10 2.00.05 1.5+0.10 -0.00 1.0 min. 0.6+0.00 -0.40 3.200.20 3.100.20 1.500.20 (mm) application carrier width cover tape width devices per reel sot -26 8 5.3 3000
2011.06 ver.1.0 copyright grenergy opto, inc. www .grenergy-ic.com 8 GR8030 taping direction information sot-26 grenergy opto, inc. reserves the right to make corr ections, modifications, enhancements, improvements, and other changes to its products and services at any time and to dis continue any product or service without notice. cus tomers should obtain the latest relevant information before placing orders a nd should verify that such information is current a nd complete. aaa aaa aaa aaa aaa aaa aaa direction of feed direction of feed
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