Abstract: This research studies the new digital control of switching power supply based on TI’s TMS320F2812.Replacing  analog controllers with digital controller is an innovation for switching power.Being different from the past,the digital control of switching power supply improves the PFC and system efficiency and reduces weight and volume,and it is  easy to debug and upgrade power supply.

Key words: PFC, phase-shifted full-bridge, TMS320F2812