This application note describes a design strategy for a Power Factor Correction (PFC) circuit and higher-power conversion efficiency using FL6961 and FL6300A. Based on this design guideline and several functions of each controller for LED lighting applications, a design example with detailed parameters demonstrates the performance.
The document outlines a design strategy for an AC-DC converter utilizing the BCM PFC controller FL6961 in the front end and the Quasi-resonant (QR) flyback controller FL6300A in the back end. This configuration is intended for 75~200W applications, offering high efficiency with relatively low cost by eliminating reverse-recovery losses of the boost diode and utilizing zero-voltage switching.
The design example specifies an Output of DC-DC Converter as 24V/2.9A (70W).
The design example targets an Overall Efficiency of 90%, with PFC and QR efficiencies at 95%.