STEVAL-ISA140V1 15W, 12V output, isolated flyback converter using VIPer™ Plus VIPER37HE Data brief 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. Features • AC Main Input voltage range: 100 VAC to 265 VAC • Mains frequency (fL): 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 VAC: 50 mW • Active mode efficiency: 78% • Ambient operating temperature: 60 °C • RoHS compliant November 2014 DocID025733 Rev 2 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com Schematic diagram 1 STEVAL-ISA140V1 Schematic diagram Figure 1. STEVAL-ISA140V1 circuit schematic T1 L1 BR RMB6S C2 15uF C3 15uF D6 L2 STPS5H100UF C4 1nF R1 220k 12V-1.25A 3.3uH C9 470uF D1 STTH1L06A C10 100uF C11 1uF 2 3 - + 1mH D4 D3 BAT41ZFILM BAT41ZFILM R3 133K 4 1 CM 2X20mH R12 2.2M C1 220nF - X2 RV R2 4.7 D2 BAT41ZFILM VIPER37HE C5 220pF R5 220 F1 VDD DRAIN C6 33uF R10 130k R9 82k CONTROL CONT 2A FB AC IN GND C12 10nF D5 18V R4 30k C8 33nF R6 47k IC2 TS432 C7 2.2nF OPTO SFH610A-2 C13 2.2nF 2/4 R8 12k BR 320V AC IN OPTO SFH610A-2 IC1 NTC 16 GND R7 1k DocID025733 Rev 2 R11 15k STEVAL-ISA140V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 19-Dec-2013 1 Initial release. 14-Nov-2014 2 Title has been updated. DocID025733 Rev 2 3/4 4 STEVAL-ISA140V1 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 information 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 order 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 4/4 DocID025733 Rev 2