500W Power-Factor-Corrected (PFC) Converter Design with FAN4810 (PDF)
This application note describes the theory of operation and step-by-step process to design a high performance Power Factor Corrected (PFC) power supply using the FAN4810 controller IC.
Advantages Using A Boost-Follower In a PFC Pre-Regulator (PDF)
Conventionally, PFC (power-factor corrected) off-line power converters are designed with two power stages: The first stage is typically a boost converter because that topology has continuous input current that can be shaped through the use of a multiplier, and average current mode control, to achieve near-unity power factor (PF.) However, the boost converter requires a higher output voltage than the input and requires a second converter to step this voltage down to a usable level.
Power Factor
An introduction and explanation of power factor, including power factor correction
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