AN3112解决方案为一个固定关断时间控制PFC预稳压器设计的L6564

AN3112解决方案为一个固定关断时间控制PFC预稳压器设计的L6564

AN3112
Application note
Solution for designing a fixed off-time controlled PFC pre-regulator
with the L6564

Introduction
In this document we propose a third approach to the operation of PFC pre-regulators. In
addition to the transition mode (TM) and the fixed-frequency continuous conduction mode
(FF-CCM) operation of PFC pre-regulators, an alternative approach is offered that couples
the simplicity and affordability of TM operation with the high-current capability of FF-CCM
operation. This solution is a peak current