This reference design is a high-density and high-efficiency, 5-kW power factor correction (PFC) converter implemented with TI's high-performance GaN power switches. A peak system efficiency of 99% with an open-frame power density of 120 W/in3 was measured. The power stage uses a two-phase totem pole PFC in a brand new topology and control mechanism. The new control method operates with variable frequency and maintains zero voltage switching (ZVS) over all operating conditions. The control is implemented with a TMS320F280049C high-performance microcontroller. The operating frequency range of the converter is approximately between 100 kHz and 800 kHz.
