ev6903ds-00a high efficiency synchronous rectification ev board ev6903ds-00a rev. 1.0 www.monolithicpower.com 1 10/19/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the ev6903ds-00a is an evaluation board for the MP6903DS. it is configured to provide synchronous rectification solution for llc topology. MP6903DS features a synchronous gate output which enables high efficiency rectification by relating the schottky rectifier with a low ron mosfet. electrical specifications parameter symbol value units supply voltage v dd 8?24 v features ? works with both standard and logic level fets ? compatible with energy star, 1w standby requirements ? v dd range from 8v to 24v ? fast turn-off total delay of 20ns ? max 400khz switching frequency ? <300 a quiescent current at light load mode ? supports ccm, crcm and dcm operation mode ? supports high-side and low-side rectification applications ? industrial power systems ? distributed power systems ? battery powered systems ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. ev6903ds-00a evaluation board (l x w x h) 1.14? x 1.14? x 0.6? 2.9cm x 2.9cm x 1.4cm board number mps ic number ev6903ds-00a MP6903DS
ev6903ds-00a ? high efficiency synchronous rectif ication ev board ev6903ds-00a rev. 1.0 www.monolithicpower.com 2 10/19/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. evaluation board schematic 1 2 d3 1 2 d1 ns 4 5, 6, 7 , 8 1, 2, 3 q2 ns 100k r2 1nf c2 2.2f c1 vg vs vd vdd en pgnd r3 3 2 1 q1 mosfet vss 5 vg 8 vd 4 nc 7 rll 3 pgnd 1 en 2 vdd 6 u1 mp6903 / so8 0 r1 1 2 d2 ns r4 ev6903ds-00a bill of materials qty refdes value description package manufacturer manufacturer p/n 1 c1 2.2 f ceramic cap., 25v, x7r 0805 murata grm21br71e225ka73l 1 c2 1nf ceramic cap., 50v, x7r 0603 tdk c1608x7r1h102k 1 r1 0 film res., 5% 0603 yageo rc0603jr-070rl 1 r2 100k film res., 1% 0603 yageo rc0603fr-07100kl 1 r3 1k film res., 1% 0603 royalohm 0603f1001t5e 0 r4 ns n-ch 100v 8.8m ? to220-ab vishay sup90n10-8m8p 1 q1 mosfet n-ch 100v 8m ? to220 apec ap85t10gp 0 q2 ns powerpak- so8 0 d1 ns smc 0 d2 ns to220 1 d3 diodes 75v/0.15a sod323 diodes in4148ws-7-f 1 u1 MP6903DS MP6903DS so-8 mps MP6903DS
ev6903ds-00a ? high efficiency synchronous rectif ication ev board ev6903ds-00a rev. 1.0 www.monolithicpower.com 3 10/19/2011 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
ev6903ds-00a ? high efficiency synchronous rectif ication ev board notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. ev6903ds-00a rev. 1.0 www.monolithicpower.com 4 10/19/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. quick start guide 1. connect the positive and negative terminals of the output or the auxiliary winding to the vdd and vss pins, respectively. 2. connect the drain and source and gate terminals of the synchronous power mosfet to the vd and vs and vg pins, respectively (there is already a 100v power mosfet q1 connected on the board, if the customer do not want to use this mos as synchronous mosfet, you can remove this q1 and use your own mosfet instead). 3. preset the input voltage of flyback converter to the normal input range, and then turn off the power supply. 4. turn the power supply on. the ic will automatica lly startup and drive the synchronous mosfet q1 to work as an ideal diode.
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