This application note describes key steps involved in the rapid design of a continuous conduction mode (CCM) PFC stage driven by the NCP1653.

The NCP1653 is a controller for CCM power factor correction step-up pre-converters. It controls the power switch conduction time (PWM) in a fixed-frequency mode and in dependence on the instantaneous coil current. Housed in a DIP8 or SO8 package, the circuit minimizes the number of external components and drastically simplifies the PFC implementation. It also integrates high safety protection features that make the NCP1653 a driver for robust and compact PFC stages, such as an effective input power runaway clamping circuitry. Generally, the NCP1653 is an ideal candidate in systems where cost-effectiveness, reliability, and high power factor are key parameters.