Key facts
- Brand
- Fairchild
- Model
- ML4824
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-07-12
Start here
Fairchild ML4824 Off-Line PFC-PWM Combo Controller Application Note
This document is an application note for the Fairchild ML4824, a controller IC designed for off-line power factor correction (PFC) and pulse width modulation (PWM) cascade converters. It introduces a novel method using a leading/trailing edge modulation scheme to synchronize two cascaded power stages, thereby reducing output ripple voltage and simplifying loop compensation compared to traditional trailing edge modulation.
Read onlineFairchild ML4824 specifications
| Output Voltage (Example) | +12V at up to 16 amps |
|---|---|
| Input Voltage Range | 80 to 264Vac |
| Switching Frequency | 100kHz |
| PFC Output Voltage (Example) | 380Vdc |
Source: Fairchild ML4824 Combo Controller Application Note AN42009
All Fairchild ML4824 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the input voltage range for the application circuit shown?
The application circuit is designed to accept an AC input voltage ranging from 80 to 264V.
From: Fairchild ML4824 Off-Line PFC-PWM Combo Controller Application Note
What are the test conditions for the ML4824 versus ML4819 comparison?
The comparison was conducted with a 50pF capacitor, 220V AC input, 75W average power, 80kHz frequency, and 1.5mH inductance.
From: Fairchild ML4824 Off-Line PFC-PWM Combo Controller Application Note
What is the minimum voltage rating required for resistor R7?
Resistor R7 must have a voltage rating of at least 400 volts to ensure reliable operation.
From: Fairchild ML4824 Combo Controller Application Note AN42009
How does the ML4824 handle soft-start?
The controller features a dedicated soft-start pin to control the rate of rise of output voltage, preventing overshoot during power on.
From: Fairchild ML4824 Combo Controller Application Note AN42009
What package types are available for the ML4824?
The ML4824 is offered in a 16‑Pin PDIP (P16) and a 16‑Pin Wide SOIC (S16W) package.
From: Fairchild ML4824 Power Factor Correction PWM Controller Datasheet
What is the maximum PWM switching frequency?
The PWM section can operate at frequencies up to 250 kHz.
From: Fairchild ML4824 Power Factor Correction PWM Controller Datasheet