data brief for further information contact your local stmicroelectronics sales office. november 2007 rev 1 1/4 4 STEVAL-ISA012V1 3 phase power supply with viper and power mosfets features minimum ac input voltage = 90 v ac maximum ac input voltage = 450 v ac time of hold up capability > 50 ms mean input power < 6 w (in compliance with iec62053-21) input connections allowed: ? 1-phase with neutral ? 2-phase without neutral ? 3-phase with neutral v out1 = 5 v, i out1 = 10 ma v out2 = 3.3 v, i out2 = 100 ma maximum precision error = 3% maximum ripple voltage = 50 mv line regulation = +/- 1% load regulation = +/- 1% output power (peak) = 550 mw description this reference design represents a cost effective solution for low power high voltage power supplies. it has been developed to cover applications requiring an ultra-wide input voltage range (between 90 and 450 v ac ), typical of three- phase applications. this requires the use of very high voltage components, which increases cost, size, weight and the overall complexity of the power supply. the circuit includes a switching transistor connected between the input rectifier and the dc bulk capacitor (stmicroelectronics patent). the series switch limits the dc input voltage of the power converter by means of a driving circuit; thus the smps primary transistor can be selected as a standard part as well as a smart power primary ic. typical end applications for this solution can be found in the industrial market in the range below 5 w, such as three-phase and single-phase power meters, industrial bias power supplies and auxiliary smps for high vo ltage street lighting, where the input voltage can range from 90 v ac to 450 v ac and 1000 v power mosfets are currently used. STEVAL-ISA012V1 www.st.com
board schematic STEVAL-ISA012V1 2/4 1 board schematic figure 1. schematic smd 1 vout vin 8 2 gnd 3 gn d gn d 6 gn d 7 nc 4 inh 5 u2 l4931abd33 layout hints: q1 mounted on 1cm x 0.8cm copper area. c8&c10 have to be closed to the viper12as. gnd pins for u2 have to be soldered to a unique copper area. rf3 22e 0.75w rf2 22e 0.75w rf4 22e 0.75w rf1 22e 0.75w 630v smd smd smd 50v smd 50v smd r1 330k smd r2 330k smd + c6 22uf 25v 1 2 3 q1 std3nk50z d5 z mm 15 c3 220nf so5k275/275v rv3 so5k275/275v rv2 so5k275/275v rv1 d4 180v 1 2 10 6 4 5 t1 l2 10uh 100ma smd c2 220nf d3 180v + c5 330uf 25v d6 tmbat49 r8 4.7k smd c9 100nf 2 1 3 u3 ts2431 r3 330k smd l1 1mh ntc1 50e r7 4.7k + c8 10uf 50v 1 2 4 3 u4 pc817 c10 47nf r5 220e smd r9 5.6k smd d7 ll4148 r4 10e r6 1k d 8 vdd 4 fb 3 s 1 s 2 d 7 d 6 d 5 u1 viper12as p1 p2 n p3 630v smd gnd vdd 3.3v + c7 2.2uf 25v + c4 2.2uf450v sod-80 c1 2.2nf/2kv (y1) note: 5v@10ma 3.3v@100ma 2 3 1 4 -+ d1 bridge 2 3 1 4 -+ d2 bridge
STEVAL-ISA012V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 28-nov-2007 1 initial release
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