AN2755 Datasheet, PDF (1/24 Pages) STMicroelectronics – 400 W FOT-controlled PFC pre-regulator with the L6562A

AN2755
Application note
400 W FOT-controlled PFC pre-regulator with the L6562A
Introduction
This application note describes an demonstration board based on the transition-mode PFC
controller L6562A and presents the results of its bench demonstration. The board
implements a 400 W, wide-range mains input PFC pre-conditioner suitable for ATX PSU, flat
screen displays, etc. In order to allow the use of a low-cost device like the L6562A at this
power level, usually prohibitive for this device, the chip is operated with fixed-off-time control.
This allows continuous conduction mode operation, normally achievable with more
expensive control chips and more complex control architectures.
Figure 1. Demonstration board (EVL6562A-400W)
July 2008
Rev 1
1/24
www.st.com