STEVAL-ISA171V1 STMicroelectronics

STEVAl-ISA171V1 Data brief 12 V - 15 W quasi resonant flyback converter based on the VIPER35HD Features Wide input voltage range: 90 V to 264 V AC AC Output voltage: 12 V Output current: 1.25 A Rated output power: 15 W Quasi resonant operation Input power standby 230 V : < 30 mW AC Active mode efficiency: > 82% EMI: pre-compliance with EN55022-Class-B RoHS compliant Description The STEVAL-ISA171V1 implements a 15 W power supply designed in quasi resonant flyback topology for a wide-range AC input voltage. Its key features are its small size and minimal bill of material, high efficiency and low standby consumption. The core of the application is the VIPER35, the quasi-resonant offline high voltage converter from the VIPerPLUS product family. The VIPER35 integrates an 800 V rugged power MOSFET with PWM current-mode control. Extremely low consumption under no-load conditions is ensured thanks to burst mode operation that reduces the average switching frequency and minimizes all Product summary frequency-related losses. STEVAL-ISA171V1 - 12 The VIPER35 operates in quasi resonant mode, a feature that helps to meet the EMI V - 15 W quasi resonant STEVAL- standards. flyback converter based ISA171V1 on the VIPER35HD VIPER35 - VIPerPlus family: Quasi-resonant VIPER35HD high performance off line high voltage converter DB2744 - Rev 2 - September 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAl-ISA171V1 Schematic diagram 1 Schematic diagrams Figure 1. STEVAL-ISA171V1 circuit schematic D6 L1 12V-1.25A T1 3.3uH STPS5H100B BR C2 C3 C4 DBLS105G 15uF 15uF R1 1nF 220k C9 C10 C11 D1 470uF 100uF 1uF MRA4007T3G D4 D3 GND R7 1k BAT41ZFILM BAT41ZFILM CM R2 2X15mH 4.7 R3 R12 133K 330k C1 D2 OPTO1 BAT41ZFILM SFH610A-2 R8 12k 100nF - X2 IC1 V IP E R 3 5 H D RV C5 V D D D R A IN 220pF R10 320V 130k B R R5 R9 CONTROL 220 82k F1 C O N T 2A C6 33uF F B G N D C12 10nF D5 18V C8 IC2 AC IN AC IN 33nF R4 TS432 30k R11 C7 OPTO 15k 2.2nF R6 SFH610A-2 C13 47k 2.2nF DB2744 - Rev 2 page 2/4 - +