This training provides a review of an AC/DC power supply reference design with universal AC input and 25V/13.5A and 12V/1A outputs. An LLC+PFC combo controller is applied for the main 25V/13.5A output, while a flyback is applied for the auxiliary 12V/1A output. This design has low no load power consumption (152mW@230VAC) and over 93% peak efficiency. This design also meets the 80PLUS Gold requirement for 115VAC internal power supplies.