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EV4032-1-S-00A 108v ac to 132v ac /60hz, 18v out /350ma primary-side-control with active pfc off-line dimmable led dr iver evaluation board EV4032-1-S-00A rev.1.01 www.monolithicpower.com 1 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the EV4032-1-S-00A evaluation board is designed to demonstrate the capabilities of mp4032-1. the mp4032-1 is a triac- dimmable, primary-side-controlled, offline, led lighting driver with an integrated 500v mosfet. it can achieve a high power factor and accurate led current control for lighting applications in a single-stage converter.. it works in boundary conduction mode for reducing the mosfet and diode switching losses. the EV4032-1-S-00A is typically designed for driving a 6.5w triac dimmable led bulb with 18v typ , 350ma led load from 108v ac to 132v ac , 60hz. the EV4032-1-S-00A 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, short-circuit protection, cycle by cycle current limit, etc. electrical specification parameter symbol value units input voltage v in 108 to 132 v ac output voltage v out 18 v led current i led 350 ma output power p out 6.5 w efficiency (full load) >82 % power factor pf >0.95 thd thd <15 % features ? fast start up ? triac dimmable, with 1% to 100% dimming range and the dimming curve meets standard ssl6 ? real current control without secondary- feedback circuit ? internal mosfet with 500v high voltage rating ? unique architecture for superior line regulation ? high power factor>0.95 over 108v ac to 132v ac ? boundary conduction mode improves efficiency ? input uvlo ? cycle-by-cycle current limit ? over-voltage protection (ovp) ? short-circuit protection (scp) ? over-temperature protection (otp) applications ? solid state lighting ? industrial & commercial lighting ? residential lighting 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 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.
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 2 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. EV4032-1-S-00A evaluation board (l x w x h) 50mm x 32mm x 15mm board number mps ic number EV4032-1-S-00A mp4032-1 evaluation board schematic pgnd agnd pgnd agnd agnd agnd agnd agnd output led+ led- 18v/350ma 1 2 22uf 50v c7 1m/1%/0.25w r6 1m/1%/0.25w r10 mb6s 3 4 2 1 bd1 600v/ 0.5a 1 2 2.2mh/0. 3a l3 1 2 3 mmbt3906lt1 q1 -40v/-0.2a 15/1% r8 1n4148w s 1 2 d1 75v/0.15a ssn1n45bta 2 3 1 q2 450v/0.5a bzt52c15 1 2 d2 15v/5ma 510/1w r9 2 1 5.6nf 50v c6 pgnd bav21w 1 2 d3 200v/0. 2a 1206 2 1 22nf/630v c8 1206 499k/ 1% r12 1 2 d4 1n4007/1kv/1a mbrs3200t3g 1 2 d5 200v/3a 1 2 2.2nf/ 4kv cy1 1206 100/1% r13 comp 1 mult 2 zcd 3 vcc 4 gnd 5 cs 6 drain 8 u1 mp4032-1gs 220nf c1 400v 510 1w r3 510 1w r4 1206 10k/1% r1 1206 10k/1% r2 ss-5-1a 2 1 1a/250v f1 input 108~132vac/60hz 1 2 4.7mh 0.25a l1 1 2 4.7mh 0.25a l2 tvr10241ks rv1 1206 2 1 10nf 630v c2 9.53k 1% r11 1206 1. 5/1% r16 pgnd 1 2 47nf 400v c4 1206 1. 5/1% r17 1 2 470uf 25v c10 1 2 470uf 25v c11 2 1 33nf 50v c3 255k/1% r7 1206 2 1 680pf/1kv c5 2 1 10pf 50v c12 0 r19 2 1 ns c13 pgnd 0805 2 1 4.7uf/16v c9 33k/1% r14 7.87k/ 1% r15 1n4148ws 1 2 d6 75v/0.15a 1 2 1500 ? @100mhz 0805 l4 1206 30k/ 1% r18 1k/1%/1206 r5 rm6 2 1 6 aux+ b w np:ns:naux=96:16:20 t1 lp=2.596mh figure 1?schematic
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 3 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pcb layout (single-sided) figure 2?top layer figure 3?bottom layer
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 4 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. circuit description the EV4032-1-S-00A 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, l2, r1, r2, bd1, c2, l3, r5 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, l2, r1, r2, c2, l3, r5 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. r6, r7, r8, c3, c5, d1, d2, q1, q2 with r9 compose the damping circuit for reducing the inrush current at the dimmer turning on time. the circuit let the inrush current flow through r9 at first when triac dimmer turns on. then q2 turns on and shorts r9, this can save power from r9. q1 is used to discharge c3 when the triac is off. d2 is used to clamp the gate voltage of q2 to 15v. r3, r4, c1 are used as a bleeder circuit which keeping the triac current above the minimum holding current after triac turns on. r10, r11, c6 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. r13, d3, c7 are used to supply the power for mp4032-1. a 22 f bulk capacitor c7 is selected to maintain the supply voltage. at start-up, c7 is first charged up from the drain pin through an internal high-voltage drain charger. once the vcc voltage reaches 13.8v, the control logic initiates and the gate drive signal forces the integrated high-voltage power mosfet to begin switching for normal operation. meanwhile, the drain charger stops, and the power supply is taken over by the auxiliary winding through r13, d3. r14, r15 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 r14, r15. c12 is used to restrain the oscillation caused by the leakage inductor and the parasitical capacitor to avoid mis-triggering ovp. d6 is used to clamp the negative voltage on zcd pin when switch on. r16, r17 are primary sensing resistors for primary side current control. the value of r16, r17 set the output led current. c8, r12, d4 are used to damp the leakage inductance energy so the drain voltage can be suppressed at a safe level. diode d5 rectifies the secondary winding voltage and the capacitor c10, c11 are the output filter. the resistor r18 is placed as pre-load to limit the output voltage rise too high in open load condition.
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 5 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. EV4032-1-S-00A bill of materials qty ref value description package manufacturer manufactuer_p/n 1 bd1 mb6s diode;600v;0.5a; soic-4 taiwan semiconductor mb6s 1 c1 220nf capacitor;400v;cbb dip panasonic ecqe4224kf 1 c2 10nf ceramic capacitor; 630v;x7r;1206; 1206 tdk c3216x7r2j103k 1 c3 33nf ceramic capacitor; 50v;x7r;0603; 0603 murata grm188r71h333ka61d 1 c4 47nf capacitor;400v;cbb dip panasonic ecqe4473kf 1 c5 680pf ceramic capacitor; 1000v;u2j;1206; 1206 murata grm31b7u3a681jw31l 1 c6 5.6nf ceramic capacitor; 50v;x7r;0603; 0603 murata grm188r71h562ka01d 1 c7 22uf electrolytic capacitor; 50v;electrolytic;dip dip jianghai cd281l-50v22 1 c8 22nf ceramic capacitor; 630v;x7r;1206 1206 tdk c3216x7r2j223k 1 c9 4.7uf ceramic capacitor; 16v;x7r;0805 0805 murata grm21br71c475ka73l 2 c10, c11 470uf electrolytic capacitor; 25v;electrolytic dip rubycon 25zlf470mefc10x12.5 1 c12 10pf ceramic capacitor; 50v;c0g;0603; 0603 tdk c1608cog1h100d 1 c13 ns 1 cy1 2.2nf capacitor;4000v;20% dip hongke jnk12e222my02n 2 d1, d6 1n4148ws diode;75v;0.15a; sod-323 diodes 1n4148ws-7-f 1 d2 bzt52c15 zener diode; 15v;5ma/500mw; sod-123 diodes bzt52c15 1 d3 bav21w diode;200v;0.2a; sod-123 diodes bav21w-7-f 1 d4 1n4007 diode;1000v;1a do-41 diodes 1n4007 1 d5 mbrs3200 t3g diode;200v;3a; smb on mbrs3200t3g 1 f1 ss-5-1a fuse;250v;1a dip cooper bussmann ss-5-1a 2 l1, l2 4.7mh inductor; 4.7mh;9.5;250ma dip wurth 744772472 1 l3 2.2mh inductor; 2200uh;4.73 ohm;0.3a dip wurth 7447720222 1 l4 1500 ? @100mhz magnetic bead; 1500 ? @100mhz; 0.3 ? , 1000ma 0805 wurth 742792097
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 6 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. EV4032-1-S-00A bill of materials (continued) qty ref value description package manufacturer manufactuer_p/n 1 q1 mmbt3906l t1 transistor;-40v;-0.2a; sot-23 on semiconductor mmbt3906lt1 1 q2 ssn1n45bt a mosfet;450v;0.5a to-92 fairchild ssn1n45bta 2 r1, r2 10k ? film resistor;1% 1206 yageo rc1206fr-0710k 3 r3, r4, r9 510 ? resistor;5%;1w dip any any 1 r5 1k ? resistor;1% 1206 hottechohm ri1206l1001ft 2 r6, r10 1m ? resistor;1%;1/4w dip any any 1 r7 255k ? film resistor;1% 0603 yageo rc0603fr-07255kl 1 r8 15 ? film resistor;1% 0603 yageo rc0603fr-0715rl 1 r11 9.53k ? film resistor;1% 0603 yageo rc0603fr-079k53l 1 r12 499k ? film resistor;1%; 1206 yageo rc1206fr-07499kl 1 r13 100 ? resistor;1%;1/4w 1206 yageo rc1206fr-07100rl 1 r14 33k ? film resistor;1%; 0603 yageo rc0603fr-0733kl 1 r15 7.87k ? film resistor;1% 0603 yageo rc0603fr-077k87l 2 r16, r17 1.5 ? resistor;1% 1206 royalohm 1206f150kt5e 1 r18 30k ? resistor;1% 1206 yageo rc1206fr-0730kl 1 r19 0 film resistor;5 %; 0603 yageo rc0603jr-070rl 1 rv1 tvr10241k s metal oxide varistor; 10mm; 240v; 4000a dip tks tvr10241ks 1 t1 fx0281 rm6; lp=2.596mh; np:ns:naux=96:16:2 0 rm6 emei rm6p6m2.6-00 1 u1 mp4032-1 offline led lighting driver soic8-7a mps mp4032-1gs-z
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 7 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. transformer specification electrical diagram figure 4?transformer electrical diagram notes: 1. don?t connect x to any pin of bobbin. 2. don?t connect aux+, w and b to any pin of bobbin, add black teflon tube to b, white tube to w. winding diagram n 4 n 3 n 1 to p . side 1ts 1ts 3ts pin. side 1ts n 2 bobbin figure 5?winding diagram teflon tube sec. side n 1 n 4 2 1 n 3 w winding start pri. side b n 2 6 x aux+
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 8 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. winding order tape layer number winding no start & end magnet wire (mm) turns 1 n 1 2? x 0.18*1 48 1 n 2 aux+? 6 0.15*1 20 1 n 3 w? b 0.35*1(t.i.w) 16 3 n 4 x? 1 0.18*1 48 electrical specifications item measurements characteristics test conditions t=254 ; hr(%)=4515 remark primary inductance (lp) pin(2-1) 2.596mh8% f(khz)=70 ug(v)=0.25 serial mode dcr pin(2-1) 3.0 ? max. / 4 wires mode turn ratio (2-1):(aux-6):(w-b) 96ts:20ts:16ts0.5ts f(khz)=20 ug(v)=1 ug apply pin(2-1) pri. side ~ sec. side no breakdown ( 1.0ma) v ac =3500v pri. side ~ core no breakdown ( 1.0ma) v ac =2000v electrical strength sec. side ~ core no breakdown ( 1.0ma) v ac =2000v 1sec. f(hz)=60 materials item description 1 core: rm6, ui=250025%, al=184.5h/n 2 3% gap, acme p4 or equivalent 2 bobbin: rm6, 3+3pin rmmove pin6 1sect th, pm9630 ul94v-0 3 wire: 0.15 & 0.18mm, 2uew, class b or equivalent 4 triple insulation wire: 0.35mm,trw(b) or equivalent 5 tape: 6.5mm(w)0.06mm(th) 6 tape: 3.5mm(w)0.06mm(th) 7 varnish: john c. dolph co, bc-346a or equivalent 8 adhesive: 400-36 or equivalent 9 solder bar: chen nan: sn99.5/cu0.5 or equivalent
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 9 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results performance data efficiency, pf and thd f (hz) v in (v ac ) i in (ma) p in (w) v out (v) i out (ma) p out (w) efficiency (%) pf thd (%) 108 74 7.97 18.46 354.5 6.544 82.11 0.991 8.9 110 72 7.92 18.44 353.6 6.520 82.33 0.990 8.9 115 69 7.86 18.43 353.3 6.511 82.84 0.987 9.0 120 66 7.81 18.42 353.3 6.508 83.33 0.984 9.1 125 63 7.79 18.42 353.4 6.510 83.56 0.981 9.2 130 61 7.76 18.41 353.4 6.506 83.84 0.977 9.2 60 132 60 7.75 18.41 353.3 6.504 83.93 0.975 9.2 dimming compatibility (no flicker with these 27 different dimmers) manufacturer part no. power stage i max (ma) i min (ma) dimming ratio min start current (ma) lutron 6b38-dvlv-600p 600w 333 6 1.80% 6 lutron 6b38-dv-603pg 600w 241 5 2.07% 5 lutron 6b38-s-600p 600w 330 1 0.30% 1 lutron 6b38-s-603pg 600w 246 2 0.81% 2 lutron s-600 600w 357 1 0.28% 1 lutron slv-600p 600w 341 6 1.76% 6 lutron 6b38-gl-600-iv 600w 356 8 2.25% 8 lutron ntlv-600-al 600w 355 6 1.69% 6 lutron ay-600p 600w 342 8 2.34% 8 lutron tg-603gh-wh 600w 221 9 4.07% 9 lutron tg-600ph-wh 600w 341 11 3.23% 11 lutron cn-600p 600w 334 5 1.50% 5 leviton rpi06 600w 357 0 0.00% 11 leviton 6633-p-1g10o5 600w 357 0 0.00% 1 lutron 6b38-q-600p 600w 341 9 2.64% 9 lutron 6b38-dv-600p 600w 329 2 0.61% 2 cooper 6b28 600w 357 0 0.00% 10 lutron lg-600p 600w 337 3 0.89% 3 leviton 1g40o5 600w 347 0 0.00% 4 leviton 6615-p0w 300w 355 54 15.21% 54 leviton c20-6684-iw 600w 356 0 0.00% 5 lutron dvelv-303p-wh 300w 355 8 2.25% 8 lutron dv-600p-br 600w 333 3 0.90% 3 lutron dvpdc-203p-wh 200w 355 50 14.08% 50 lutron maelv-600-wh 600w 344 0 0.00% 13 lutron ay-600p-la 600w 350 13 3.71% 13 lutron gl-600h-dk 600w 355 2 0.56% 2
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 10 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 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 1kv surge testing was completed according to iec61547. input voltage was set at 110v ac /60hz. output was loaded at full load and operation was verified following each surge event. surge level (v) input voltage (v ac ) injection location injection phase () test result (pass/fail) +1000 110 l to n 0 pass -1000 110 l to n 0 pass +1000 110 l to n 90 pass -1000 110 l to n 270 pass thermal test without dimmer @ v in =108v ac output short without dimmer @ v in =132v ac 50% dimming @vin=120v ac ic:60.2 ic:38.8 bleeding resistor:61.4
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 11 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results performance waveforms are tested on the evaluation board. v in =120v ac /60hz, 6 leds in series, i led =350ma, v out =18v, l p =2.6mh, n p :n s :n aux =96:16:20
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 12 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. evb test results (continued) performance waveforms are tested on the evaluation board. v in =120v ac /60hz, 6 leds in series, i led =350ma, v out =18v, l p =2.6mh, n p :n s :n aux =96:16:20
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 13 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. quick start guide 1. preset ac power supply to 108v ac v in 132v ac . 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. 6. for triac dimming led lighting application, especially in deep dimming situation, the led would shimmer caused by the dimming on duty which is not al l the same in every line cycle. what?s more, the grid has noise or inrush which would bring out shimmer even flicker. the suppressor circuit would help to improve this. for detailed information please refer to appendix.
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver EV4032-1-S-00A rev.1.01 www.monolithicpower.com 14 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. appendix ripple suppressor (innovative proprietary) for dimming led lighting application, a single stage pfc converter needs large output capacitor to reduce the ripple whose frequency is double of the grid. and in deep dimming situation, the led would have shimmer caused by the dimming on duty which is not all the same in every line cycle. what?s more, the grid has noise or inrush which would bring out shimmer even flicker. figure 9 shows a ripple suppressor, which can shrink the led current ripple obviously. figure6?ripple suppressor principle shown in figure 6, resister r, capacitor c, and mosfet m compose the ripple suppressor. through the rc filter, c gets the mean value of the output voltage v co to drive the mosfet m. m works in variable resistance area. c?s voltage v c is steady makes the leds voltage is steady, so the leds current will be smooth. mosfet m holds the ripple voltage v co of the output. diode d and zener diode d z are used to restrain the overshoot at start-up. in the start-up process, through d and d z , c is charged up quickly to turn on m, so the led current can be built quickly. when v c rising up to about the steady value, d and d z turn off, and c combines r as the filter to get the mean voltage drop of v co . the most important parameter of mosfet m is the threshold voltage v th which decides the power loss of the ripple suppressor. lower v th is better if the mosfet can work in variable resistance area. the bv of the mosfet can be selected as double as v co and the continues drain current level can be selected as decuple as the leds? current at least. about the rc filter, it can be selected by rc linecycle 50 / f . diode d can select 1n4148, and the zener voltage of d z is as small as possible when guarantee o ddz c_pp vv 0.5v +>? . optional protection circuit in large output voltage or large leds current application, mosfet m may be destroyed by over-voltage or over-current when led+ shorted to led- at working. gate-source(gs) over-voltage protection figure 7?gate-source ovp circuit figure 7 shows gs over-voltage protection circuit. zener diode d g and resistor r g are used to protect mosfet m from gs over-voltage damaged. when led+ shorted to led- at normal operation, the voltage drop on capacitor c is high, and the voltage drop on gate-source is the same as capacitor c. the zener diode d g limits the voltage v gs and r g limits the charging current to protect d g . r g also can limit the current of d z at the moment when led+ shorted to led-. v dg should bigger than v th . drain-source over-voltage and over-current protection as figure 8 shows, npn transistor t, resistor r c and r e are set up to protect mosfet m from over-current damaged when output short occurs at normal operation. when led+ shorted to led-, the voltage v ds of mosfet is equal to the v co which has a high surge caused by the parasitic parameter. zener dioder d ds protects mosfet
EV4032-1-S-00A ? low line voltage, 6.5w psr with pfc dimmable led driver 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. EV4032-1-S-00A rev.1.01 www.monolithicpower.com 15 6/27/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. from over-voltage damaged. transistor t is used to pull down the v gs of m. when m turns off, the load is opened, then the ovp mode is triggered, and the ic functions in quiescent. the pull down point is set by r c and r e : co ce v r/r 0.7v 2 ?= . figure 8?drain-source ovp and ocp circuit mosfet list in the table 1, there are some recommended mosfet for ripple suppressor. table 1: mosfet list manufacture p/n manufacture v ds /i d v th (v ds =v gs @t j =25c) package power stage si4446dy vishay 40v/3a 0.6-1.6v@ id=250 a so-8 <10w ftd100n10a ips 100v/17a 1.0-2.0v@ id=250 a to-252 5-15w p6015cdg niko-sem 150v/20a 0.45-1.20v@ id=250 a to-252 10-20w

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