AN2782的L6562A 1 400瓦的固定关断时间控制的PFC预调节器设计方案

AN2782的L6562A 1 400瓦的固定关断时间控制的PFC预调节器设计方案

AN2782
Application note
Solution for designing a 400 W fixed-off-time controlled
PFC preregulator with the L6562A

Introduction
In addition to the transition mode (TM) and fixed-frequency continuous conduction mode
(FF-CCM) operation of PFC pre-regulators, a third approach is proposed that couples the
simplicity and affordability of TM operation with the high-current capability of FF-CCM
operation. This solution is a peak current-mode control with fixed off-time (FOT). Design
equations are given and a pract