Description

Advanced PWM controller FAN302UL significantly simplifies isolated power supply designs that require Constant Current (CC) regulation of the output. The output current is precisely estimated with information in the primary side of the transformer and controlled with an internal compensation circuit, not only removing the output current sensing loss, but also eliminating external CC control circuitry. A Green-Mode function with an extremely low operating current (200µA) in Burst Mode maximizes light-load efficiency, enabling conformance to worldwide Standby Mode efficiency guidelines.

Features

mWSaver™ Technology Provides Best-in-Class Standby Power

Achieves <10mW, Far Below Energy Star’s 5-Star Level (<30mW).

Proprietary 500V High-Voltage JFET Startup Reduces Startup Resistor Loss

Low Operation Current in Burst Mode: 350µA Maximum

Constant-Current (CC) Control without Secondary Side Feedback Circuitry

Fixed PWM Frequency at 140kHz with Frequency Hopping to Reduce EMI

High-Voltage Startup

Low Operating Current: 3.5mA

Peak-Current-Mode Control with Slope Compensation

Cycle-by-Cycle Current Limiting

VDD Over-Voltage Protection (Auto-Restart)

VS Over-Voltage Protection (Latch Mode)

VDD Under-Voltage Lockout (UVLO)

Gate Output Maximum Voltage Clamped at 15V

Fixed Over-Temperature Protection (Latch Mode)

Available in an 8-Lead SOIC Package

Applications

Battery chargers for cellular phones, cordless phones, PDA, digital cameras, and power tools. Replaces linear transformers and RCC SMPS.