may 2009 doc id 15545 rev 2 1/5 5 STEVAL-ISA054V1 100 w 3-phase auxiliary power supply demonstration board based on the stw9n150 features input voltage ? connector 1: 400 vac rms 20% input voltage ? connector 2: 180 - 265 vac rms input frequency: 50 hz output 1: 24 v @ 4 a output 2: 5v @ 1 a or 3.3 v @ 1 a output power: 100 w safety: en60950 emi: en55014 rohs compliant description this demonstration board introduces a solution for industrial power supplies. it takes advantage of the high voltage power mosfet, i.e. 1500 v breakdown voltage, to optimize the operation of the flyback converter based on the primary controller uc3844b. the demonstration board has been designed and developed in order to address medium power applications. the board features two outputs, 24 v, 5v or 3.3 v, and is able to deliver more than 100 w in total. the 5 v/3.3 v output is obtained by means of an integrated dc-dc converter based on l5970d, connected to the 24 v output, and adjustable by means of an external voltage divider. STEVAL-ISA054V1 www.st.com
circuit schematic STEVAL-ISA054V1 2/5 doc id 15545 rev 2 1 circuit schematic figure 1. schematic am019 83 v1 c9 1nf c10 1nf + co1 560uf 35v + c2 68uf450v j2 con3 1 2 d3 stth108 c4 2.2n 1600v + co4 560uf 35v c13 47nf-x2 r6 2.2k 1% c15 2.2nf-y1 + c3 330uf 25v d2 1n4148 r17 330k 2w + c5 68uf 450v r1 330k 2w c12 47nf-x2 f1 fuse l1 28mh 1 4 3 2 r29 12 r23 0.6 r19 1k l6 10uh t ntc - 10 l5 1mh 1 2 l2 1mh 1 2 l3 1mh 1 2 q6 2sd882 3 2 1 r26 100 q7 2sb772 3 1 2 24v + c16 560uf 35v q5 stw9n150 1 2 3 r18 15k d6 1n4007 1 2 r27 27 c14 10nf r28 12 r2 1m 1/8w i > 4a j3 con1 1 2 j4 con2 1 2 + co2 560uf 35v r4 1m 1/8w r10 4.7k c6 100nf r11 56k r20 24k 1% u4 pc817 r7 1m 1/8w d8 stps20120cfp r9 1m 1/8w d5 stth108 r8 1k d9 1n4007 1 2 r13 47k 3w r3 10 d10 1n4007 1 2 + co3 560uf 35v d11 1n4007 1 2 t5 tr an sf or mer 5 7 6 2 10 12 r5 91k 1% u3 tl1431 2 1 3 u1 uc3844b vfb 2 comp 1 vref 8 rt/ct 4 sense 3 out 6 vcc 7 gnd 5
STEVAL-ISA054V1 ci rcuit schematic doc id 15545 rev 2 3/5 figure 2. dc-dc converter am019 8 6v1 r16 5.6k 1% r14 10k 1% sw1 u2 l5970d out 1 sy nc 2 inh 3 comp 4 fb 5 vref 6 gnd 7 vcc 8 cin 10uf 25v ceramic c7 22nf r12 4.7k c8 220p d7 stps2l25u l4 33uh >1a + cout 470uf 10v 24v +3.3v / +5v r15 3.3k 1% j5 con4 1 2
revision history STEVAL-ISA054V1 4/5 doc id 15545 rev 2 2 revision history table 1. document revision history date revision changes 01-apr-2009 1 initial release 11-may-2009 2 updated features in cover page
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