for further information contact your local stmicroelectronics sales office. november 2014 docid025733 rev 2 1/4 STEVAL-ISA140V1 15w, 12v output, isolated flyback converter using viper? plus - viper37he data brief features ? ac main input voltage range: 100 v ac to 265 v ac ? mains frequency (f l ): 50 hz / 60 hz ? output voltage typ: 12 v ? output current: 1.25 a ? output ripple voltage: 50 mv ? rated output power: 15 w ? input power in standby @230 v ac : 50 mw ? active mode efficiency: 78% ? ambient operating temperature: 60 c ? rohs compliant description the STEVAL-ISA140V1 is a 15 w wide range evaluation board based on the viper37he. it is designed as an example of an isolated auxiliary power supply. the board and the transformer were designed and optimized in order to have a very compact size evaluation board. www.st.com
schematic diagram STEVAL-ISA140V1 2/4 docid025733 rev 2 1 schematic diagram figure 1. STEVAL-ISA140V1 circuit schematic c6 33uf d4 bat41zfilm l2 3.3uh r4 30k 16 ntc c4 1nf gnd 12v-1.25a opto sfh610a-2 opto sfh610a-2 c12 10nf c10 100uf ic2 ts432 br cont drain gnd control fb vd d ic1 viper37he + - br rmb6s r7 1k t1 f1 2a d2 bat41zfilm ac in ac in d6 stps5h100uf d3 bat41zfilm r6 47k r2 4.7 2 1 3 4 cm 2x20mh c8 33nf r8 12k c7 2.2nf r3 133k c9 470uf d5 18v 15k r11 r9 82k c3 15uf r10 130k r5 220 d1 stth1l06a c13 2.2nf r1 220k rv 320v r12 2.2m l1 1mh c5 220pf c2 15uf 1uf c11 c1 220nf - x2
docid025733 rev 2 3/4 STEVAL-ISA140V1 revision history 4 2 revision history table 1. document revision history date revision changes 19-dec-2013 1 initial release. 14-nov-2014 2 title has been updated.
STEVAL-ISA140V1 4/4 docid025733 rev 2 important notice ? please read carefully stmicroelectronics nv and its subsidiaries (?st?) reserve the right to make changes, corrections, enhancements, modifications, and improvements to st products and/or to this document at any time without notice. purchasers should obtain the latest relevant in formation on st products before placing orders. st products are sold pursuant to st?s terms and conditions of sale in place at the time of o rder acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers? products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with provisions different from the information set forth herein shall void any warranty granted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2014 stmicroelectronics ? all rights reserved
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