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Design a continuous conduction mode PFC stage

Posted: 16 Sep 2008     Print Version  Bookmark and Share

Keywords:Continuous Conduction Mode  Power Factor Correction  PFC stages 

The NCP1654 is a controller for Continuous Conduction Mode (CCM) Power Factor Correction (PFC) 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 SO8 package, the circuit minimises the number of external components and drastically simplifies the PFC implementation. It also integrates high safety protection features that make the NCP1654 a driver for robust and compact PFC stages like an input power runaway clamping circuitry. Generally, the NCP1654 is a candidate in systems where cost-effectiveness, reliability and high power factor are the key parameters.

This application note provides steps to design a Continuous Conduction Mode (CCM) Power Factor Correction (PFC) stage driven by the NCP1654. The process is illustrated by the following practical application:

* Maximum output power: 300W

* Input voltage range: 85Vrms to 265Vrms

* Regulation output voltage: 390V

* Switching frequency: 65kHz

View the PDF document for more information.





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