Design of a PFC controller for DC-DC power management unit

A PFC controller was designed for DC-DC purpose.Combined with PWM controller,a single chip 350 W off-line power solution was implemented with high PFC,high performance and high reliability.The total converter system was base on architecture issue and circuit implementation.The PFC function was controlled by positive edge of pulse,and the PWM function was controlled by negative edge.The single chip with time-saving cost-cut performs well and its off-chip related components were reduced.