Fairchild ML4824 Manuals

This document describes a novel method for an off-line power factor correction (PFC) - PWM combo controller. The controller improves power usage efficiency and reduces harmonic content in the line current.

ML4824 is a high performance power controller launched by Fairchild. This application note introduces the working principle and application circuits of ML4824.

Introduces the ML4824's features, including internally synchronized PFC and PWM, low total harmonic distortion, reduces ripple current in the storage capacitor between the PFC and PWM sections, average current, continuous boost leading edge PFC, voltage loop fast transconductance error amp, high efficiency trailing edge PWM can be configured for current mode or voltage mode operation, average line voltage compensation with brownout control, PFC overvoltage comparator eliminates output “runaway” due to load removal, current fed gain modulator for improved noise immunity, overvoltage protection, UVLO, and soft start