Description

The highly integrated SG6741 PWM controller provides several features to enhance the performance of flyback

converters.

The highly integrated SG6741 series of PWM controllers provides several features to enhance the performance of flyback converters.

Features

ƒ High-Voltage Startup

ƒ Low Operating Current: 4mA

ƒ Linearly Decreasing PWM Frequency to 22kHz

ƒ Frequency Hopping to Reduce EMI Emission

ƒ Peak-Current-Mode Control

ƒ Cycle-by-Cycle Current Limiting

ƒ Leading-Edge Blanking

ƒ Synchronized Slope Compensation

ƒ Gate Output Maximum Voltage Clamp: 18V

ƒ VDDOver-Voltage Protection (Auto Restart)

ƒ VDDUnder-Voltage Lockout (UVLO)

ƒ Internal Open-Loop Protection

ƒ Constant Power Limit (Full AC Input Range)

Applications

General-purpose switch-mode power supplies and flyback power converters, including:

ƒ Power Adapters

ƒ Open-Frame SMPS