Abstract: A power factor correction (PFC) stage, controller, and control method are described. The PFC stage includes: a totem-pole converter having an input inductor for coupling to ac mains, first and second pairs of power switches, and an output capacitor for coupling to a bus; an auxiliary capacitor having a lower capacitance than the output capacitor; and a circuit configured to couple the auxiliary capacitor in parallel with the output capacitor in a first state and to the input inductor in a second state; and a controller. If a line drop out (LDO) condition is detected on the bus, the controller sets the circuit in the second state and operate the first pair of power switches as a DC-DC boost converter under peak current control. If no LDO condition is detected on the bus, the controller sets the circuit in the first state and operate the totem-pole converter under average current control.

Abstract: A resonant power converter including synchronous rectifiers adapted to operate with an overlapping conduction phase and a fixed frequency.