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EV4033-K-00B 108vac~132vac/60hz, 24v/350ma primary-side-control with active pfc off-line dimmable led driver evaluation board EV4033-K-00B rev.1.0 www.monolithicpower.com 1 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the EV4033-K-00B evaluation board is designed to demonstrate the capabilities of mp4033 with ripple suppressor. the mp4033 is a primary-side-control offline led lighting controller which can achieve high power factor and accurate current for triac dimmable led lighting application. its adaptive dimmer type detection and phase-cut-based dimming control can achieve good dimmer compatibility and deep dimming range. it works in boundary conduction mode for reducing the mosfet and diode switching losses. the new ripple suppressor can obviously reduce the output current ripple and escape the flicker or shimmer happened in deep dimming situation with a little influence in efficiency. the EV4033-K-00B is typically designed for driving an 8w triac dimmable led bulb with 24v typ , 350ma led load from 108vac to 132vac, 50hz. the EV4033-K-00B has an excellent efficiency and meets iec61547 surge immunity, iec61000-3-2 class c harmonics and en55015 conducted emi requirements. it has multi-protection function as over-voltage protection; winding short circuit protection; output short-circuit protection, cycle by cycle current limit, etc. electrical specification paramete r symbol v alue units input voltage v in 108 to 132 vac output voltage v out 24 v led current i led 350 ma output power p out 8.4 w efficiency (full load) >81 % power factor pf >0.9 thd thd <20 % features ? fast start up ? adaptive dimmer type detection and phase-cut-based dimming control ? triac dimmable, with good dimmer compatibility and deep dimming range ? the dimming curve meets standard ssl6 ? direct pwm dimming ? real current control without secondary- feedback circuit ? programmable current fold-back to prolong the led lifetime (ntc) ? accurate line & load regulation ? high power factor over 198vac to 265vac ? boundary conduction mode improves efficiency ? input uvlo ? cycle-by-cycle current limit ? over-voltage protection (ovp) ? output short-circuit protection (scp) ? winding short circuit protection ? zcd pin short circuit protection ? over-temperature protection (otp) ? fit inside a19 bulb enclosure applications ? solid state lighting ? industrial & commercial lighting ? residential lighting a ll 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 o f monolithic power systems, inc. warning: although this board is designed to satisfy safety requirements, the engineering prototype has not been agency approved. therefore, all testing should be performed using an isolation transformer to provide the ac input to the prototype board.
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 2 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EV4033-K-00B evaluation board (l x w x h) 62mm x 25mm x 23mm board numbe r mps ic numbe r EV4033-K-00B mp4033gk evaluation board schematic 22nf/630v c1 499k/1206 r1 tvr10241 rv1 2.2nf/250v cy1 f1 250v/1a 20/1w r13 20/1w r12 68nf/450v c3 330nf/250v c2 330/2w r5 bd1 mb6s 470nf/25v c6 d3 rlz te-11 18d d1 s1ml 1 2 3mh/0.21a l1 2 3 1 q3 ced830g 500v/4.5a 1m/1%/0.25w r2 470k/0.5w r3 1kv/1a 2 1 6 aux+ b w rm6 t1 l3 n1 108vac-132vac np:ns:naux=84:24:22 lp=1.42mh 4.7nf/50v c11 bav21w d5 7.5k/1% r17 22uf/50v c13 4.12k/1% r18 20k/1% r16 2.2uf/10v c10 1.5/1%/1206 r19 300m/1%/1206 r20 d10 1n4148w 200v/0.2a mult 1 zcd 2 vcc 3 damp 4 dim 5 d 6 s 7 ntc 8 gnd 9 comp 10 u1 mp4033k ntc1 220k 75v/0.15a 16.82v/10ma 100nf/450v c4 20/1206 r10 d6 1n4148w 75v/0.15a 51 r7 led+ led- 2k/1206 r14 100v/1a d9 b1100 30k r9 10k r4 20k r11 22uf/50v c9 d2 1n4148 bzt52c2v4 d4 bzt52c4v7 d8 1 2 330uf/35v c7 3 2 1 q1 am2340ne/sot23 bav21w d7 200v/0.2a 2.4v/5ma 4.7v/5ma 40v/5.2a 30k/1206 r6 output: 24v/350ma 510/2w r8 2 3 1 q2 ssn1n45bta 450v/0.5a 10nf/50v c8 1 2 330uf/35v c5 4.7nf/25v c12 1k r15 option 2 option 1 figure 1?schematic
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 3 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. pcb layout (single-sided) figure 2?top layer figure 3?bottom layer
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 4 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. circuit description the EV4033-K-00B is configured in a single- stage flyback topology; it uses primary-side- control which can mostly simplify the schematic and get a cost effective bom. it can also achieve high power factor and accurate led current. f1, rv1, l1, r12, r13, c3, bd1 and c4 compose the input stage. f1 fuses the ac input to protect for the component failure or some excessive short events. rv1 is used for surge test. l1, r12, r13, c3 and c4 associated with cy1 form the emi filter which can meet the standard en55015. the diode rectifier bd1 rectifies the input line voltage. small bulk cbb capacitor c4 is used for a low impedance path for the primary switching current, to maintain high power factor, the capacitance of c4 should be selected with low value. r8, q2 with c8 compose the damping circuit.. the dimmer compatibility is well without this circuit. it only helps to reduce the inrush current thro dimmer at the moment dimmer turning on. the circuit let the inrush current flow through r8 at the moment triac dimmer turning on. then q2 turns on and shorts r8, this can save power loss from r8. r5, c2 are used as a bleeder circuit which keeping the triac current above the minimum holding current after triac turns on. r2, r17, c11 provide sine wave reference for the primary peak current to get an active pfc function. the divided voltage should be lower than the max voltage rating of mult pin. r10, d5, and c13 are used to supply the power for mp4033. a 22 f bulk capacitor c13 is selected to maintain the supply voltage. at start-up, c13 is first charged up through the external mosfet q3 and internal charging circuit, when the vcc voltage reaches 10v, the internal charging circuit stops charging. then the power supply is taken over by the auxiliary winding through r10, d5. r3, c6, r7, d3 and d6 are used for the gate drive of the external mosfet q3. r16, r18 and d10 are used to detect the auxiliary winding to get the transformer magnetizing current zero crossing signal for realizing the boundary conduction operation, and also monitor the output ovp condition. the ovp voltage is set by the divider ratio of r16 and r18. r19, r20 are primary sensing resistors for primary side current control. the value of r19, r20 set the output led current. c1, r1, d1 are used to damp the leakage inductance energy so the drain voltage can be suppressed at a safe level. diode d9 rectifies the secondary winding voltage and the capacitor c5, c7 are the output filter. the resistor r6 is placed as pre-load to limit the output voltage rise too high in open load condition. r4, r11, r9, r14, c9, d7, d2, d4, d8, and q1 compose the ripple suppressor. r4, r11 and c9 offer a stable drive voltage to q1. d2 and d4 compose the fast start up circuit, which help charge c9 quickly at the moment power on. d7, r9 and r4 add a bias voltage to the gate of q1, which will help save the power loss of the ripple suppressor obviously.
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 5 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EV4033-K-00B bill of materials qty ref value description package manufacturer manufactuer_p/n 1 bd1 mb6s bridge, 600v, 0.5a soic-4 taiwan semiconductor mb6s 1 c1 22nf/630v ceramic cap, 630v x7r 1206 tdk c3216x7r2j223k 1 c2 330nf/250v cbb,250v dip cl21xx-250v-330n 1 c3 68nf/450v 683/450v dip fala c222s683j30c000 1 c4 100nf/450v 104/450v dip fala c222s104k30c000 2 c5, c7 330 f/35v electrolytic capacitor, 35v, electrolytic dip jianghai cd263-35v330 1 c6 470nf/50v ceramic cap,x7r,50v 0603 murata grm188r71e474ka12d 1 c13 22 f/50v electrolytic capacitor; 50v;electrolytic dip jianghai cd281l-50v22 1 c10 2.2 f/10v ceramic cap,10v,x7r 0603 murata grm188r71a225ke15d 2 c11, c12 4.7nf/50v ceramic cap,x7r,50v 0603 murata grm188r71h472ka01d 1 cy1 2.2nf/4000v y capacitor,4000v dip hongke jnk12e222my02n 1 d1 wsgc10mh diodes,1000v,1a sod-123 zowie wsgc10mh 1 d3 rlz te-11 18d zener diodes/16.82v, 10ma sod-123 rohm rlz te-11 18d 1 d5 bav21w diode;200v;0.2a; sod-123 diodes bav21w-7-f 2 d6, d10 1n4148ws diode;75v;0.15a; sod-323 diodes 1n4148ws-7-f 1 d9 b1100 diode;100v;1a sma diodes b1100-13-f 1 f1 250v/1a fuse dip any 1 l1 inductor,3mh inductor,3mh/dr8*10 dip hulsin hdr0810-302m 1 ntc 220k ? thermistor 0603 murata mcp13wm224e03r8 1 q3 ced830g n-channel mosfet, 500v, 4.5a to-251 cet ced830g 1 r1 499k ? film res, 1% 1206 yageo rc1206fr-07499kl 1 r2 1m ? dip,0.25w resistor dip any 1m ? /0.25w 1 r3 470k ? /0.5w resistor;5%;0.5w dip any 470k ? /0.5w 1 r5 330 ? dip,2w resistor dip any 330 ? /2w 1 r6 30k ? resistor;1% 1206 yageo rc1206fr-0730kl 1 r7 51 ? film res,1% 0603 yageo rc0603fr-0751rl 1 r10 20 ? film res;1% 1206 yageo rc1206fr-0720rl 2 r12, r13 20 ? dip,1w resistor dip any 20 ? /1w 1 r15 1k ? film res, 1% 0603 yageo rc0603fr-071kl 1 r16 20k ? film res, 1% 0603 yageo rc0603fr-0720kl 1 r17 7.5k ? film res, 1% 0603 yageo rc0603fr-077k5l 1 r18 4.12k ? film res, 1% 0603 yageo rc0603fr-074k12l
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 6 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. EV4033-K-00B bill of materials (continued) qty ref value description package manufacturer manufactuer_p/n 1 r19 1.5 ? film res, 1% 1206 royalohm 1206f150kt5e 1 r20 300m ? film res, 1% 1206 yageo rl1206fr-070r3l 1 rv1 tvr10241ksy 240v/2500a dip tks tvr10241ksy 1 t1 rm6 rm6, lp=1.42mh np:ns:naux=84:24:22, rm6 emei fx0368 1 u1 mp4033gk mp4033gk msop10 mps mp4033gk r2 1 r8 510 ? dip,2w resistor dip any 510 ? /2w 1 q2 ssn1n45bta n-channel mosfet450v;4250/10v; 8.5 to-92 fairchild ssn1n45bta 1 c8 10nf/50v ceramic cap,x7r,50v 0603 murata grm188r71h103ka01d 1 c9 22uf/50v electrolytic capacitor;50v;electrol ytic dip jianghai cd281l-50v22 1 d2 1n4148ws diode;75v;0.15a; sod- 323 diodes 1n4148ws-7-f 1 d7 bav21w diode;200v;0.2a; sod- 123 diodes bav21w-7-f 1 d8 bzt52c4v7s zener diode, 4.7v, 5ma sod- 323 diodes bzt52c4v7s 1 d4 bzt52c2v4s zener diode, 2.4v, 5ma sod- 323 diodes bzt52c2v4s 1 q1 am2340ne n-channel mosfet, 40v,5.2a sot23 analog power am2340ne 1 r4 10k ? film res;1% 0603 yageo rc0603fr-0710kl 1 r9 30k ? film res;1% 0603 yageo rc0603fr-0730kl 1 r11 20k ? film res;1% 0603 yageo rc0603fr-0720kl 1 r14 2k ? film res;1% 1206 yageo rc1206fr-072kl note: 1. the components in red compose the damping circuit, which is used to reduce the inrush current with leading edge dimmer. it is optional. 2. the components in blue compose the ripple suppressor. it is optional.
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 7 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. transformer specification electrical diagram figure 4?transformer electrical diagram notes: 1. don?t connect nc to any pin of bobbin. 2. w and b are pulled out and marked with different teflon tube. winding diagram n 4 n 3 n 1 to p . side 1ts 1ts 3ts pin. side 1ts n 2 bobbin figure 5?winding diagram
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 8 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. winding order winding no. tape layer numbe r start & end magnet wire (mm) turns n 1 0 2 nc 0.18mm * 1 42 n 2 1 aux+ 6 0.15mm * 1 22 n 3 1 w b 0.35mm (t.i.w) 24 n 4 1 nc 1 0.18mm * 1 42 electrical specifications electrical strength 60 second, 60hz, from pri. to sec. 2500vac 60 second, 60hz, from pri. to core. 1000vac 60 second, 60hz, from sec. to core. 1000vac primary inductance pins 1 - 2, all other windings open, measured at 100khz, 0.1 vrms 1.42mh8% primary leakage inductance pins 1 - 2 with all other pins shorted, measured at 100khz. 0.1 vrms 23 h10% materials item description 1 core: rm6, ui=250025%, al=221.5h/n 2 2% gap, acme p4 or equivalent 2 bobbin: rm6, 3+3pin rmmove pin6 1sect th, pm9630 ul94v-0 3 wire: 0.16mm, 2uew, class f or equivalent 4 triple insulation wire: great 0.35mm,trw(b) or equivalent 5 teflon tube: tfl awg#30 6 teflon tube: tfl awg#24 7 tape: 6.5mm(w)0.06mm(th) 8 tape: 4.0mm(w)0.06mm(th) 9 varnish: john c. dolph co, bc-346a or equivalent 10 solder bar: chen nan: sn99.5/cu0.5 or equivalent
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 9 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance data efficiency, pf and thd f (hz) vin(v) pin(w) vo(v) io(ma) po(w) efficiency(%) pf thd(%) 60 90 10.24 23.62 353 8.34 81.42 0.985 12.10 100 10.10 23.62 354 8.36 82.79 0.978 13.70 110 10.00 23.62 355 8.39 83.85 0.970 14.60 120 9.98 23.62 356 8.41 84.26 0.960 16.00 132 9.96 23.62 357 8.43 84.66 0.945 17.50 dimming compatibility (no flicker with these 32 different dimmers) manufacturer part no. power stage imax(ma) imin(ma) dimming ratio lutron q-600p-iv 600w 357 22 6.16% lutron cn-600p 600w 357 11 3.08% lutron ay-600p 600w 356 17 4.78% lutron slv-600p 600w 356 13 3.65% lutron lg-600p 600w 356 9 2.53% lutron 6b38-q-600p 600w 355 19 5.35% lutron gl-600h-dk 600w 358 5 1.40% leviton 1g40o5 600w 358 0 0.00% leviton 1i20o5 600w 357 0 0.00% lutron glv02-f06392 600w 358 0 0.00% leviton 6633-p 600w 357 0 0.00% lutron 6b38-s-600p 600w 358 3 0.84% lutron ct-600p 600w 354 4 1.13% lutron 6b38-s-603pg 600w 297 5 1.68% lutron 6b38-dv-600p 600w 354 4 1.13% lutron dvcl-153p 600w 357 42 11.76% lutron 6b38-dvlv-600p 600w 354 13 3.67% leviton 1l10o5 600w 357 0 0.00% lutron gls01-c06570 600w 302 0 0.00% lutron dv-600p-br 600w 354 7 1.98% leviton 6613-pl 600w 357 0 0.00% leviton c20-6684-iw 600w 356 0 0.00% lutron ay-600p-la 600w 355 27 7.61% lutron tg-600ph-wh 600w 354 21 5.93% lutron tg-603gh-wh 600w 261 18 6.90% lutron s-600 600w 357 6 1.68% lutron dvpdc-203p-wh 200w 357 63 17.65% lutron s-600p 600w 357 3 0.84% lutron 6b38-dv-603pg 600w 284 12 4.23% lutron dng-603ph-wh 400w 357 0 0.00% cooper 6b28 600w 357 0 0.00% leviton 6633-p-1g10o5 600w 357 2 0.56%
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 10 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. electric strength test primary circuit to secondary circuit electric strength testing was completed according to iec61347-1 and iec61347-2-13. input and output was shorted respectively. 3750v ac/50hz sine wave applied between input and output for 1min, and operation was verified. surge test line to line 500v and line to power earth 1kv surge testing was completed according to iec61547. input voltage was set at 120vac/60hz. output was loaded at full load and operation was verified following each surge event. surge level (v) input voltage (vac) injection location injection phase () test result (pass/fail) 500 120 l to n 90 pass -500 120 l to n 270 pass 1000 120 l to pe 90 pass -1000 120 l to pe 270 pass 1000 120 n to pe 90 pass -1000 120 n to pe 270 pass thermal test test without dimmer and with dimmer at 90% dimming on phase. without dimmer with dimmer at 90% dimming on phase ripple suppressor mosfet q1: 59.7 bleedin g resister r5: 74.8
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 11 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in =120vac/60hz, 8 leds in series, i led =350ma, v out =24v, l p =1.42mh, n p :n s :n aux =84:24:22 pf efficency vs. v in v in = (90-132)v ac /60hz, full load pf vs. v in v in = (90-132)v ac /60hz, full load line regulation full load thd vs. v in v in = (90-132)v ac /60hz, full load v in (v) v in (v) v in (v) conducted emi l-line v in = 120v ac /60hz, full load, rbw = 9khz, mt = 20ms conducted emi n-line v in = 120v ac /60hz, full load, rbw = 9khz, mt = 20ms 6db 9 khz 30 mhz sgl 1 pk clrwr 2 av clrwr tds 6db 9 khz 30 mhz sgl 1 pk clrwr 2 av clrwr tds v in (v) 100 khz 1 mhz 10 mhz 0 10 20 30 40 50 60 70 80 90 100 110 120 en55015a en55015q 100 khz 1 mhz 10 mhz 0 10 20 30 40 50 60 70 80 90 100 110 120 en55015a en55015q dimming curve v in =120v ac /60hz, full load, with different dimmers output current (ma) 0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 120 140 160 dimmer #l2-1 dimmer #l2-7 dimmer #l3-11 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 90 100 110 120 130 30.0 40.0 50.0 60.0 70.0 80.0 90.0 90 100 110 120 130 0.9 0.91 0.92 0.93 0.94 0.95 0.96 0.97 0.98 0.99 1 90 100 110 120 130 0 2 4 6 8 10 12 14 16 18 20 90 100 110 120 130
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 12 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in =120vac/60hz, 8 leds in series, i led =350ma, v out =24v, l p =1.42mh, n p :n s :n aux =84:24:22. v mult 500mv/div. i in 100ma/div. input voltage and current v in =120v ac /60hz, full load v damp 10v/div. v cc 10v/div. v cc 10v/div. v s 500mv/div. v mult 500mv/div. i out 200ma/div. v damp 10v/div. v cc 20v/div. v mult 1v/div. i out 500ma/div. v damp 10v/div. v comp 1v/div. v mult 1v/div. i in 100ma/div. v damp 10v/div. v comp 1v/div. v mult 1v/div. i in 100ma/div. v damp 10v/div. v comp 1v/div. v mult 1v/div. i in 100ma/div. v damp 10v/div. v comp 1v/div. v mult 1v/div. i in 100ma/div. v comp 1v/div. v comp 2v/div. v zcd 5v/div. v zcd 2v/div. v s 1v/div. v mult 1v/div. steady state v in =120v ac /60hz, full load v in start up v in =120v ac /60hz, full load steady state v in =120v ac /60hz, full load dimming performance max dimming on phase with leading-edge dimmer v in =120v ac /60hz, with dimmer dimming performance max dimming on phase with trailing-edge dimmer v in =120v ac /60hz, with dimmer dimming performance min dimming on phase with trailing-edge dimmer v in =120v ac /60hz, with dimmer dimming performance min dimming on phase with leading-edge dimmer v in =120v ac /60hz, with dimmer ovp led load open then recovery v in =120v ac /60hz, full load
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver EV4033-K-00B rev.1.0 www.monolithicpower.com 13 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in =120vac/60hz, 8 leds in series, i led =350ma, v out =24v, l p =1.42mh, n p :n s :n aux =84:24:22. v comp 2v/div. v s 500mv/div. v zcd 1v/div. v cc 10v/div. v comp 2v/div. v s 500mv/div. v zcd 2v/div. v cc 10v/div. v comp 2v/div. v s 500mv/div. v zcd 50mv/div. v cc 5v/div. ocp led+ short to led- then start up v in =120v ac /60hz, full load ocp led+ short to led- then recovery v in =120v ac /60hz, full load zcd pin short protection short zcd pin then start up v in =120v ac /60hz, full load
EV4033-K-00B ? low line voltage, 8w psr with pfc dimmable led driver notice: the information in this document is subject to change without notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. EV4033-K-00B rev.1.0 www.monolithicpower.com 14 10/20/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. quick start guide 1. preset ac power supply to 108vac v in 132vac. 2. turn power supply off. 3. connect the led string between ?led+? (anode of led string) and ?led-? (cathode of led string). 4. connect power supply terminals to ac v in terminals as shown on the board. 5. turn ac power supply on after making connections.

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