Features
■ Switch mode Quasi-Resonant Flyback Power Supply
■ Input: 88 to 138 Vac (US version)
■ Switching frequency: 50/60 Hz
■ Output1: 12 V @ 500 mA delivering 6 W with ± 10% of stability
■ Output2: 8 V @ 40 mA delivering 0.32 W with ± 15% of stability
■ Output3: 5 V @ 1 A delivering 5 W with ± 5% of stability
■ Output4: 3.3 V @ 450 mA delivering 1.485 W with ± 2% of stability
■ Output5: 1.23 V @ 1 A delivering 5 W with ± 5% of stability
■ Output6: 2.5 V @ 0.7A delivering 1.75 W with ± 2% of stability General description This document describes a reference design of a 17 W Switch Mode Power Supply dedicated to Set-Top Box applications. The board accepts US input voltages (90 to 265 Vrms) and delivers up to 6 W outputs. It is based on the L6565 quasi resonant SMPS controller, working in variable frequency mode. The Quasi-resonant operation and the high flexibility of the L6565 make it a very suitable device, able to satisfy all the requirements with only few external components. ST components
■ STTH108 High Voltage Ultrafast Rectifier, 1 A, 800 V
■ SMBYW02-200 High Efficiency Fast Recovery Rectifier Diode, 2 A, 200 V
■ STPS5L40 Power Schottky Rectifier, 5 A, 40 V
■ STPS5L25B low drop power Schottky Rectifier, 3 A, 40 V
■ STPS340 Power Schottky Rectifier, 3 A, 40 V
■ L6565 Quasi Resonant SMPS controller
■ L5973D step down switching regulator up to 2.5 A
■ LD29080DT25, 800 mA fixed and adjustable output, very low dropout voltage regulator
■ STD5NK50Z, N-channel zener protected SuperMESH Power MOSFETs, 500 V, 1.22 Ohm, 4.4 A STEVAL-ISA017V1