FAN301U PDF – PWM Controller, SO 8, Fairchid

Part Number: FAN301, FAN301U, FAN301MY

Function: PWM Controller for Low Standby Power Charger Applications

Package: SO 8 Pin type

Manufacturer: Fairchild Semiconductor

Images:FAN301U pdf


A highly integrated PWM (Pulse-Width Modulation) controller refers to a type of integrated circuit (IC) that combines multiple functions and features related to PWM control into a single chip. PWM controllers are widely used in various power management applications to regulate the output voltage or current of a power supply or power converter.

This highly integrated PWM controller, FAN301, FAN301U provides features to enhance the performance of lowpower flyback converters. The proprietary topology enables simplified circuit design for battery charger applications. A low-cost, smaller, and lighter charger is the result, compared to a conventional design or a linear transformer.

To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under light-load conditions. This green mode assists the power supply in meeting power conservation requirements.


FAN301U pinout datasheet

Highly integrated PWM controllers are commonly used in various power supply designs, including DC-DC converters, AC-DC converters, and LED drivers. By integrating multiple functions into a single IC, these controllers simplify the design process, reduce external component count, improve efficiency, and enhance reliability.


1. Ultra-Low Standby Power Under 20mW at 264VAC

2. Constant-Current (CC) Control without Secondary-Feedback Circuitry

3. Green Mode: PWM Frequency Linearly Decreasing

4. Fixed PWM Frequency at 45kHz with Frequency Hopping to Solve EMI Problems

5. High-Voltage Startup

6. Low Operating Current: 3mA

7. Peak-Current-Mode Control in CV Mode

FAN301U PDF Datasheet

FAN301U pdf


Related articles across the web