EV4012DS-00A boost white led driver for tv backlighting application EV4012DS-00A rev.1.01 www.monolithicpower.com 1 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the EV4012DS-00A evaluation board is designed to demonstrate the capabilities of mps? mp4012ds for tv backlighting applications. mp4012ds is a current mode controller designed for high brightness leds. with a 50-90v input vin and a 12v power supply for mp4012ds, EV4012DS-00A can deliver a regulated voltage to drive a led string. the led current is regulated to about 120ma, the EV4012DS-00A can be synchronized, several EV4012DS-00As can be used together to drive a tv panel. electrical specification parameter symbol value units input voltage vin 50-90 v ic power supply 12vin 1210% v pwm dimming pwm 510% v led current i led 120 ma switching frequency fs 100 khz over voltage protection v led-max 212 v features ? constant current wled driver ? high frequency pwm dimming ? switching frequency synchronization ? open load hiccup mode protection ? short load hiccup mode protection ? programmable cycle-by-cycle over current protection ? uvlo, thermal shutdown protection ? soft start applications ? tv backlighting ? large lcd panel backlighting all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology?, are registered trademarks of monolithi c power systems, inc. warning: although this board is designed to satisfy safet y requirements, the engineering pr ototype has not been agency approved. therefore, all testing should be performed using an isolation transformer to provide the ac input to the prototype board. EV4012DS-00A evaluation board (l x w x h) 7.35cm x 5.84cm x 14mm board number mps ic number EV4012DS-00A mp4012ds efficiency (%) v in (v) efficiency vs. v in 90.00 91.00 92.00 93.00 94.00 95.00 96.00 97.00 50 60 70 80 90
EV4012DS-00A ?boost white led driver for tv backlighting application EV4012DS-00A rev.1.01 www.monolithicpower.com 2 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. evaluation board schematic sync 8 cs 5 vdd 2 cl 9 ovp 12 iset 15 rt 7 gnd 4 vin 1 ref 10 pwm 13 fb 16 sl 6 gate 3 fault 11 comp 14 u1 mp4012/so16 c1 c2 c7 l1 d2 us1g c9 33nf c10 220pf c12 3k r12 r4 r6 1.58k r5 nc c5 nc c6 30k r9 560k r8 21k r11 10k r15 4.3k r14 9.09k r13 c13 3.32 r22 21.5k r20 953k r21 2k r16 led+ led- 1k r1 20.5k r2 1nf c4 1k r19 nc r7 vin pwm a-dim sync nc r18 c3 fault 12vin nc r17 ref ref ref m1 m2 220pf c8 100nf c11 nc r3 nc d1 nc r23 nc r24 20 r10 nc c14 nc c15 8 5 2 7 1 3 4 6 cn1 EV4012DS-00A bill of materials qty ref value description package manufacturer manufacturer p/n 2 c1, c2 2.2 f ceramic capacitor;100v;x7r;1210 1210 murata grm32er72a225ka35l 1 c3 0.1 f ceramic capacitor;100v;x7r;0805 0805 tdk c2012x7r2a104k 1 c4 1nf ceramic capacitor;50v;x7r;0603 0603 tdk c1608x7r1h102k 4 c5, c6, c14, c15 nc 1 c7 1 f ceramic capacitor;25v;x5r;0805 0805 murata grm216r61e105ka12d 2 c8, c12 220pf ceramic capacitor;50v;x7r;0603 0603 murata grm188r71h221ka01d 1 c9 1 f ceramic capacitor;25v;x7r;0603 0603 murata grm188r71e105ka12 1 c10 33nf ceramic capacitor;50v;x7r;0603 0603 murata grm188r1h333ka61d 1 c11 100nf ceramic capacitor;25v;x7r;0603 0603 murata grm188r71h104ka01d 1 c13 1 f/400v film capacitor;400v; dip dip cbb 1 f/400v 2 led+, led- connector connector
EV4012DS-00A ?boost white led driver for tv backlighting application EV4012DS-00A rev.1.01 www.monolithicpower.com 3 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. EV4012DS-00A bill of materials (continued) qty ref value description package manufacturer manufacturer p/n 1 cn1 conn/9pin/2.54mm/ right angle conn/9pin/2.54mm 1 d1 nc 1 d2 us1g diode;400v;1a sma multicomp us1g 1 l1 320 h inductor;320uh;efd20 dip inductor 1 m1 smk730f n-mos;400v;5.5a;1 ? to-220 auk smk730f 1 m2 smk0260d n-mos;600v;2a;3.9 ? to-252 auk smk0260d 1 jr1 0 film resistor;5% 0603 royalohm 0603j0000t5e 1 jr2 0 film resistor;5 % 1206 yageo rc1206jr-070rl 1 jr3 0 film resistor;5% 0805 royalohm 0805s8j0000t5e 5 jw1, jw2, jw3, jw4, jw5 jump wire jump wire 2 r1, r19 1k film resistor;1% 0603 yageo rc0603fr-071kl 1 r2 20.5k film resistor;1% 0603 yageo rc0603fr-0720k5l 6 r3, r7, r17, r18, r23, r24 nc 2 r4, r6 200m sense resistor;1%;1/2w 1206 cyntec rl1632h-r200-fn 1 r5 1.58k film resistor;1% 0603 yageo rc0603fr-071k58l 1 r8 560k film resistor;1% 0603 yageo rc0603fr-07560kl 1 r9 30k film resistor;1%; 0603 yageo rc0603fr-0730kl 1 r10 20 film resistor;1%; 0603 yageo rc0603fr-0720rl 1 r11 21k film resistor;1% 0603 yageo rc0603fr-0721kl 1 r12 3k film resistor;1% 0603 yageo rc0603fr-073kl 1 r13 9.09k film resistor;1% 0603 yageo rc0603fr-079k09l 1 r14 4.3k film resistor;1% 0603 lion rc0603fr-074k3l 1 r15 10k film resistor;1% 0603 yageo rc0603fr-0710kl 1 r16 5.1k film resistor;1% 0603 yageo rc0603fr-075k1l 1 r20 23.2k film resistor;1% 0603 yageo rc0603fr-0723k2l 1 r21 1m film resistor;1% 1206 yageo rc0603fr-071ml 1 r22 3.3 resistor;1% 1206 royalohm 1206f330kt5e 1 u1 mp4012ds mp4012ds soic16 mp4012ds
EV4012DS-00A ?boost white led driver for tv backlighting application EV4012DS-00A rev.1.01 www.monolithicpower.com 4 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. vin = 64v, 12vin=12v, vled=200v, iled = 120ma, t a = 20oc, unless otherwise noted. pwm duty pwm dimming curve 0 20 40 60 80 100 120 140 0 0.2 0.4 0.6 0.8 1 v ds 100v/div. v comp 5v/div. v out 100v/div. i l 500ma/div. v ds 100v/div. v comp 5v/div. v out 100v/div. i led 100ma/div. steady state soft start pwm dimming ovp recovery short load recovery v ds 100v/div. v pwm 5v/div. v out 100v/div. i led 100ma/div. v ds 100v/div. v comp 5v/div. v out 100v/div. i l 500ma/div. v ds 100v/div. v comp 5v/div. v out 100v/div. i led 100ma/div.
EV4012DS-00A ?boost white led driver for tv backlighting application EV4012DS-00A rev.1.01 www.monolithicpower.com 5 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV4012DS-00A ?boost white led driver for tv backlighting application notice: the information in this document is subject to change wi thout notice. please contact m ps 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. EV4012DS-00A rev.1.01 www.monolithicpower.com 6 11/23/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. quick start guide 1. check the led string voltage and preset the input voltage power supply to 50-90v. 2. set a second power supply 12vin to 12v as the power supply of ic. set a third power supply to 5v as the pwm input to the evb. 3. connect all sync pin of all evbs for synchronization if necessary. 4. turn-off all power supplies. connect all the power supply. 5. connect the anode of the led string to led+, and the cathode to led-. 6. turn on the vin power supply. 7. turn on the 5v pwm power supply. 8. turn on the 12vin power supply. the led string should be lighten 9. to demo the dimming function: replace the 5v pwm power supply with a function generator. set the pwm signal amplitude to 5v and the frequency within 100hz to 2khz range.
|
