This reference design is a digitally controlled, compact 1-kW AC/DC power supply design for server power supply unit (PSU) and telecom rectifier applications. The highly-efficient design supports two main power stages, including a front-end continuous conduction mode (CCM) totem-pole bridgeless power factor correction (PFC) stage. The PFC stage features TI’s LMG341x gallium nitride (GaN) FET with integrated driver to provide enhanced efficiency across a wide load range and meet 80 Plus Titanium requirements. The design also supports LMG3422 GaN FET half-bridge inductor-inductor-capacitor (LLC) isolated DC/DC stage to achieve a +12-V DC output at 1 kW. Two control cards use C2000™Piccolo™ microcontrollers to control both power stages.