EVAL-STCH03-45W STMicroelectronics

EVAL-STCH03-45W Data brief 45W / 12V power supply based on STCH03 QR flyback controller and SRK1000B adaptive synchronous rectification controller Features Input voltage range V : 90 V to 265 V IN AC AC Output range: 12 V - 3.75 A continuous operation Very low stand-by power: < 40 mW 230 Vin Average full load efficiency: > 88% 115 V IN > 89% 230 V IN Active mode at 10% load efficiency: > 84% 115 V IN > 82% 230 V IN Active mode at 10% load efficiency: > 84% 115 V > 82% 230 V IN IN Safety: Acc. to EN60065 EMI: Acc. to EN55022 - Class B Small PCB form factor: 85 x 55 X 25 mm Description The EVAL-STCH03-45W is a 45 W / 12 V isolated power supply developed for general purpose applications. The evaluation board implements a Quasi Resonant flyback converter based on the STCH03 controller with optocoupler feedback for voltage and primary side regulation for constant output current regulation. Product status link The secondary side rectification is based on the SRK1000B adaptive synchronous EVAL-STCH03-45W rectification controller. The efficiency of the application is very high over entire output power range thanks to the smart power management of the STCH03 and SRK1000B controllers, the STF10LN80K5 MDmesh K5 primary MOSFET and the STL90N10F7 Power MOSFET for the synchronous rectification. The evaluation board implements a robust output supply protected against output overvoltage, output undervoltage, output overpower and output short-circuit. The protections are auto-restart for a safe operation. DB3852 - Rev 3 - November 2019 www.st.com For further information contact your local STMicroelectronics sales office. EVAL-STCH03-45W Electrical schematic 1 Electrical schematic Figure 1. SCH-EVAL-STCH03-45W evaluation board schematic DB3852 - Rev 3 page 2/4