DN91, Synchronous Rectification Improves Set Top Box Power Supply Efficiency

Flyback converter with synchronous rectification on 5V and 3.3V output. Synchronous rectification improves set top box power supply efficiency. The note concludes with practical measurement on a 27W four-output set top box power supply to demonstrate that a 3% efficiency improvement over a Schottky solution can be achieved with the aid of the ZXGD3101 synchronous MOSFET controller