ev171-s-00a small, universal input non-isolated off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 1 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the ev171-s-00a evaluation board is designed to demonstrate the capabilities of mp171. the mp171 is a primary-side constant voltage regulator providing accurate constant voltage (cv) regulation without opto-coupler. it supports buck, buck-boost, boost and flyback topologies. the ev171-s-00a evaluation board is designed as buck application. ev171-s-00a typically drives 5v/50ma load from 85vac to 265vac, at 60/50hz. the ev171-s-00a has an excellent efficiency and meets 2kv iec61000-4-5 surge immunity and en55022 conducted emi requirements. mp171 features various protections, including thermal shutdown (tsd), vcc under-voltage lockout (uvlo), over-load protection (olp), short- circuit protection (scp), and open loop protection. mp171 is available in tsot23-5 and soic8 package. electrical specification parameter symbol value units input voltage v in 85 to 265 vac output voltage v out 5 v output current i out 50 ma features ? primary-side non-isolated constant voltage (cv) control ? integrated 700v mosfet ? <100mw no-load power consumption ? peak-current control with peak current compression ? low vcc operating current ? limited maximum frequency ? frequency foldback ? multiple protections: scp, olp, open-loop protection, tsd, and vcc uvlo ? low cost and simple external circuit ? internally biased vcc applications ? home appliance, and consumer electronics ? home automation ? standby power all mps parts are lead-free, halogen free, and adhere to the rohs directive. for mps green status, please visit m ps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of 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.
ev171-s-00a ? small off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 2 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. ev171-s-00a evaluation board (l x w x h) 17mm x 22mm x 17mm board number mps ic number ev171-s-00a MP171GS
ev171-s-00a ? small off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 3 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. evaluation board schematic l n gnd vout gnd 39 rf1 470pf c7 2.2uf c2 d1 srgc10jh 22uf c5 stth1r06 600v/ 1a d3 2. 2uf/ 400v c3 2.2uf/400v c4 1mh l1 41.2k r1 39.2k r2 22nf c1 1.2k r3 1mh l2 d4 srjc10jh d2 srgc10jh 5v/50ma 85~265vac drain 7 nc 6 nc 5 nc 8 vcc 1 fb 2 sour c e 3 sour c e 4 u1 MP171GS nc c6 figure 1?schematic
ev171-s-00a ? small off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 4 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. pcb layout (single-sided) figure 2?top layer figure 3?bottom layer
ev171-s-00a ? small off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 5 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. bill of materials qty ref value description package manufacture manufacture_pn 1 c1 22nf ceramic capacitor; 16v; x7r 0603 murata grm188r71c223ka01d 1 c2 2.2uf ceramic capacitor; 10v; x7r 0603 murata grm188r71a225ke15d 2 c3, c4 2.2uf electrolytic capacitor; 400v dip rubycon 400lle2r2mefc 1 c5 22uf ceramic capacitor; 25v; x5r 1206 murata grm31cr61e226ke15 1 c7 470pf ceramic capacitor; 50v; x7r 0603 tdk c1608x7r1h471k 3 d1, d2, d4 srgc10mh diode; 1000v; 1a 1206 zowie srgc10mh 1 d3 stth1r06 diode; 600v; 1a do-41 st stth1r06 1 l1 1mh inductor; 17.4 ? ; 100ma dip any ckl0410-102 1 l2 1mh inductor; 6 ? ; 250ma dip wurth 7447462102 1 r1 41.2k film resistor; 1% 0603 yageo rc0603fr-0741k2l 1 r2 39.2k film resistor; 1% 0603 yageo rc0603fr-0739k2l 1 r3 1.2k film resistor; 1% 0603 yageo rc0603fr-071k2l 1 rf1 39 fuse resistor; 5%; 1w dip yageo fkn1wsjt-50-39r 1 u1 mp171 buck regulator soic8 mps MP171GS
ev171-s-00a ? small off-line regulator evaluation board ev171-s-00a rev.1.0 www.monolithicpower.com 6 9/23/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. circuit description the ev171-s-00a is configured in a buck topology to demonstrate the performance of mp171. mp171 is a primary side controller which provides accurate constant voltage. it simplifies the schematic and minimizes the bom cost. fr1 is used to protect circuit from component failure or some excessive short events; also it can restrain the inrush current. c3, l1 and c4 compose clc filter to meet the conducted emi standard en55022. c3 is also used for energy storage and protecting against line surge. with fr1, c3 and c4 used, ev171-s-00a meets 2kv iec61000-4-5 surge immunity standard. c1 is the sample-hold capacitor used for reflecting output voltage. r1 and r2 are resistor divider for detecting output voltage by sampling voltage on c1. d3 is the freewheeling diode. for universal voltage applications, use a diode with a 600v reverse block voltage. fast recovery diode or ultra fast diode is recommended for better efficiency and reliable operation. c5 is the output capacitors for 5v output. r3 is dummy load to lower the output voltage of 5v rail at no load condition.
ev171-s-00a ? small off-line regulator evaluation board 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. ev171-s-00a rev.1.0 www.monolithicpower.com 7 9/23/2015 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. quick start guide 1. preset power supply to 85vac v in 265vac. 2. turn power supply off. 3. connect the line and neutral terminals of the power supply output to l and n port. 4. connect load positive and negative terminals to corresponding + and - outputs. 5. turn power supply on after making connections.
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