ML4824 is a high performance power controller launched by Fairchild. This application note introduces the working principle and application circuits of ML4824.
This document details the process of designing a high performance power supply utilizing the ML4824 Combo Controller. It demonstrates how to manage high output power while complying with international AC line quality requirements, featuring a PFC section and a dual transistor current-mode forward converter.
The guide covers specific design calculations for the Power Factor Correction (PFC) stage, including component selection for inductors, diodes, and switches. It also provides detailed instructions for voltage and current loop compensation to ensure stability and transient response.
| Output Voltage (Example) | +12V at up to 16 amps |
|---|---|
| Input Voltage Range | 80 to 264Vac |
| Switching Frequency | 100kHz |
| PFC Output Voltage (Example) | 380Vdc |
Resistor R7 must have a voltage rating of at least 400 volts to ensure reliable operation.
The controller features a dedicated soft-start pin to control the rate of rise of output voltage, preventing overshoot during power on.
Yes, there are two versions: ML4824-1 where PFC and PWM run at the same frequency, and ML4824-2 where PWM is 2X PFC frequency.