MP1029 cold cathode fluorescent lamp driver proprietary information ? rihui use only MP1029 rev. 1.4 www.monolithicpower.com 1 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. the future of analog ic technology description the MP1029 offers a complete power ic solution for driving cold cathode fluorescent lamps (ccfl). this power ic converts unregulated dc voltage to a nearly pure sine wave required to ignite and operate the ccfl. based on proprietary power topology and control techniques it greatly increases the power conversion efficiency. features ? integrated power switches ? 6.0v to 17v variable supply voltage with regulated lamp current ? 12w power output at 12v input ? open lamp regulation ? current and voltage feedback control ? logic level burst mode control ? supports open/short lamp protection ? soft-start ? output short circuit protection ? low lamp operating voltage for increasing transformers or using smaller transformers ? analog and burst dimming applications ? backlight inverters for portable/automotive dvd, gps, automotive video display systems ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. the MP1029 is covered by us patents 6,114,814, 6,316,881. typical application MP1029 bstr pgnd outr in ref comp ft ol fb agnd ab il bos db en dr in outl pgnd bstl br t/b en gnd vbatt fuse c1 r8 c14 d a * d b * c13 c8 r4 c12 c11 t1 c10 c9 c7 c6 r6 r5 r7 r1 r2 c5 c4 c15 cn1 hv c3 c2 r3 MP1029_tac *d a *, d b *: bat54 or in4148 required for v in less than or equal to 7v. www.datasheet.in
MP1029 ? cold cathode fluorescent lamp driver proprietary information ? rihui use only MP1029 rev. 1.4 www.monolithicpower.com 2 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. package reference ab il bos db en dr in outl pgnd bstl 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 agnd fb ol ft comp ref in outr pgnd bstr top view MP1029_pd01 exposed pad (tssop20f only) part number* package temperature MP1029em tssop20 ?20 c to +85 c MP1029ef tssop20f ?20 c to +85 c * for tape & reel, add suffix ?z (eg. MP1029em?z) for lead free, add suffix ?lf (eg. MP1029em?lf?z) absolute maxi mum ratings (1) input voltage (v in ) ...................................... 21v il, fb input voltages (v il , v fb ) .....................6v ol input voltage (v ol )................. ?0.3v to +12v logic input voltages ................... ?0.3v to +6.8v power dissipation...................................... 1.0w operating frequency............................. 150khz junction temperature...............................150 c lead temperature (solder) ......................260 c storage temperature ..............?55 c to +150 c recommended operating conditions (2) input voltage (v in ) .............................. 6v to 17v analog brightness voltage (v ab ) ....... 0v to 1.9v digital brightness voltage (v db )......... 0v to 1.8v enable (v en ) ......................................... 0v to 5v operating frequency (typical) ............... 60khz ambient operating temp ..........?20 c to +85 c thermal resistance (3) ja jc tssop20 .............................. 140 ..... 25... c/w tssop20f ............................ 110 ...... 6.... c/w notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on approximately 1? square of 1 oz copper. electrical characteristics v in = 12v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units reference voltage output voltage v ref i ref = 3ma 4.75 5.0 5.25 v reference current i ref 3.0 ma line regulation 6.5v < v in < 17v 30 mv load regulation 0 < i ref < 3.0ma 30 mv output drivers switch on resistance (4) r (on) 0.08 0.12 0.15 ? short circuit current i sc 4 a v comp = 0v, v in = 17v 480 630 ns minimum on time t on(min) v comp = 0v, v in = 6v 1750 2100 ns battery supply supply current (quiescent) i cc(off) 10 a supply current (operating) i cc(on) v in = 17v 1.8 2.5 ma www.datasheet.in
MP1029 ? cold cathode fluorescent lamp driver proprietary information ? rihui use only MP1029 rev. 1.4 www.monolithicpower.com 3 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. electrical characteristics (continued) v in = 12v, t a = 25 c, unless otherwise noted. parameters symbol condition min typ max units brightness control sense full brightness v il v ab = 2.0v 360 379 400 mv sense full dim v il v ab = 0v 105 117 130 mv lamp current regulation 7v < v in < 17v 2 5 % burst oscillator peak voltage v bos 1.7 1.8 1.9 v fault detect open lamp threshold v (th)ol 0 v secondary current threshold v (th)fb 1.2 v fault mode comp current i comp v ol < 0v, v fb > 1.2v 475 a shutdown logic fault timer threshold v (th)ft 1.1 1.2 1.3 v fault timer sink current v ol > 0, v fb < 1.2v 1 a fault timer source current open lamp v ol < 0, v fb < 1.2v 1 a secondary overload v fb > 1.2v 120 a enable voltage low v (l)en 0.5 v enable voltage high v (h)en 2.0 v note: 4) this parameter guaranteed by design. pin functions pin # name description 1 ab analog dimming 2 il lamp current feedback sense input 3 bos burst oscillator timing 4 db burst mode dimming 5 en chip enable. do not float this pin. 6 dr internally generated mosfet gate drive supply voltage (6v) 7 in power supply input 8 outl output to load (tank circuit) 9 pgnd power ground 10 bstl regulated output voltage fo r bootstrap capacitor on phase l 11 bstr regulated output voltage fo r bootstrap capacitor on phase r 12 pgnd power ground 13 outr output to load (tank circuit) 14 in power supply input 15 ref internally generated reference voltage output (5v) 16 comp loop compensation capacitor 17 ft fault timer 18 ol open lamp detect (lamp voltage feedback.) 19 fb shorted lamp detect (secondary current feedback) 20 agnd small signal ground (5) note: 5) for the MP1029ef, connect the exposed pad to agnd (pin 20). www.datasheet.in
MP1029 ? cold cathode fluorescent lamp driver proprietary information ? rihui use only MP1029 rev. 1.4 www.monolithicpower.com 4 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. block diagram 17 16 ab open lamp fault (olf) 1.2v short circuit 1 il 2 ol fb 18 dr 6 19 bstr 11 in 14 outr 13 pgnd 9, 12 outl 8 in 7 bstl 10 agnd en 20 5 -- + gm comp half wave rectifier protection control logic -- + -- + -- + burst dimming oscillator burst dimming clock ramp internal regulators 3 db bos ref ft comp MP1029_f01_bd01 15 4 -- + -- + -- + -- + figure 1?functional block diagram www.datasheet.in
MP1029 ? cold cathode fluorescent lamp driver proprietary information ? rihui use only MP1029 rev. 1.4 www.monolithicpower.com 5 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. operation brightness control the MP1029 can operate in three modes: analog mode, burst mode with a dc input and burst mode with an external pwm. the three modes are dependent on the pin connections as per table 1. the MP1029 has a soft on and soft off feature to reduce noise when using burst mode dimming. table 1?function mode pin connection pin 1 pin 4 pin 3 function ab db bos analog mode 0 ? 1.9v v ref agnd burst mode with dc input voltage v ref 0 to 1.8v r1 c1 burst mode from external source v ref pwm 1.5v brightness polarity: burst: 100% duty cycle is at 1.8v analog: 1.9v is maximum brightness choosing the required burst repetition frequency can be achieved by an rc combination, as defined in component selection. chip enable the chip has an on/off function, which is controlled by the en pin (#5). the enable signal goes directly to a schmitt trigger. the chip will turn on with an en = high and off with an en = low. fault protection open lamp : the ol pin (pin 18) is used to detect whether an open lamp condition has occurred. during normal operation the ol pin is typically at 5v dc with an ac swing of 2v. if an open lamp condition exists then the ac voltage on the ol line will swing below zero volts. when this occurs, the ic will regulate the ol voltage to 10v p-p and a 1 a current source will inject into the ft pin. if the voltage at the ft pin exceeds 1.2v, the chip will shut down. excessive secondary current (shorted lamp and ul safety specs): the fb pin (pin 19) is used to detect whether excessive secondary current has occurred. during normal operation the fb voltage is a 1v p-p ac signal centered at zero volts d.c. if a fault condition occurs that increases the secondary current, then the voltage at fb will be greater than 1.2v. when this occurs, the ic will regulate the fb voltage to 2.4v p-p and a 120 a current source will inject into the ft pin. if the voltage at the ft pin exceeds 1.2v, the chip will shut down. lamp startup the strike voltage of the lamp will always be guaranteed at any temperature because the MP1029 uses a resonant topology for switching the outputs. the device will continue to switch at the resonant frequency of the tank until the strike voltage is achieved. this eliminates the need for external ramp timing circuits to ensure startup. fault timer the timing for the fault timer will depend on the sourcing current as described above and the capacitor on the ft pin. the user can program the time for the voltage to rise before the chip detects a ?real? fault. when a fault is triggered, the internal drive voltage (v dr ) will collapse from 6.2v to 0v and the reference voltage will stay high at 5v. low v in applications if the minimum v in is less than 7v, it is required that the external boost diodes da and db be used. the boost diodes can be implemented using low cost components such as in4148 or bat54. www.datasheet.in
MP1029 ? cold cathode fluorescent lamp driver proprietary information ? rihui use only notice: the information in this document is subject to change wi thout notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP1029 rev. 1.4 www.monolithicpower.com 6 5/18/2006 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2006 mps. all rights reserved. package information tssop20 or tssop20f (exposed paddle) note: 1) all dimensions ar e in millimeters. 2) package length does not include mold flash, protrusion or gate burr. 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5) drawing conforms to jedec mo-153, variation act. 6) drawing is not to scale. 0.19 0.30 6.40 6.60 seating plane 0.65 bsc pin 1 id 4.30 4.50 6.20 6.60 110 11 20 0.80 1.05 1.20 max 0.00 0.15 top view front view side view 0.09 0.20 bottom view 2.60 3.10 3.80 4.30 recommended land pattern 5.80 typ 1.60 typ 0.40 typ 0.65 bsc 3.20 typ 4.40 typ detail ?a? 0.45 0.75 0 o -8 o 0.25 bsc gauge plane see detail "a" www.datasheet.in
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