A mixed-signal ASIC power-factor-correction (PFC) controller for high frequency switching rectifiers

A mixed-signal IC controller is described for single-phase PFC applications. The single-chip controller block diagram is described, and the fundamental analog and digital operating blocks are developed in detail. Implementation options for each block are given, with experimental results from a 1.2 /spl mu/m CMOS test chip included. The controller blocks are derived for boost and buck/boost type converters, but control of other power stages could be derived in the same manner. The final controller is proposed as a single-chip PFC solution, with no external design or components necessary for high-performance, stable operation over a wide range of operating conditions.