Description

This highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions.

Features

ƒ Linearly Decreasing PWM Frequency

ƒ Green Mode Under Light-Load and Zero-Load Conditions

ƒ Constant Voltage (CV) and Constant Current (CC)

ƒ No Secondary Feedback

ƒ Low Startup Current: 8μA

ƒ Low Operating Current: 3.6mA

ƒ Leading-Edge Blanking

ƒ Constant Power Limit

ƒ Universal AC Input Range

ƒ Synchronized Slope Compensation

ƒ 140°C OTP Sensor with Hysteresis

ƒ VDDOver-Voltage Clamping

ƒ Cycle-by-Cycle Current Limiting

ƒ Under-Voltage Lockout (UVLO)

ƒ Fixed PWM Frequency with Hopping

ƒ Gate Output Maximum Voltage Clamped at 17V

ƒ Small SSOT-6 Package

Applications

General-purpose, switching mode, power supplies and flyback power converters, such as:

ƒ Battery Chargers for Cellular Phones, Cordless Phones, PDAs, Digital Cameras, Power Tools

ƒ Power Adapters for Ink Jet Printers, Video Game Consoles, Portable Audio Players

ƒ Open-Frame SMPS for TV/DVD Standby and Auxiliary Supplies, Home Appliances, Consumer

Electronics

ƒ Replacement for Linear Transformers and RCC SMPS

ƒ PC 5V Standby Power