AN2994 Datasheet, PDF (1/38 Pages) STMicroelectronics – 400 W FOT-controlled PFC pre-regulator with the L6563S

AN2994
Application note
400 W FOT-controlled PFC pre-regulator with the L6563S
Introduction
This application note describes a demonstration board based on the transition-mode PFC
controller L6563S and presents the results of its bench evaluation. The board implements a
400 W, wide-range mains input, PFC pre-conditioner suitable for ATX PSU, flat screen
displays, etc. The chip is operated with fixed off time control in order to use a low-cost device
like the L6563S, which is usually prohibitive at this power level. Fixed-off-time control allows
continuous conduction mode operation, which is normally achieved with more expensive
control chips and more complex control architectures.
Figure 1. L6563S 400 W FOT PFC demonstration board (p/n EVL6563S-400W)
November 2010
Doc ID 15796 Rev 2
1/38
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