Description

This highly integrated PWM controller provides several features to enhance the performance of flyback converters.

To minimize standby power consumption, a proprietary adaptive green-mode function reduces switching frequency at light-load condition. To avoid acoustic noise problems, the minimum PWM frequency is set above 23kHz. This green-mode function enables the power supply to meet international power conservation requirements, such as Energy Star®. With the internal high-voltage startup circuitry,the power loss caused by bleeding resistors is also eliminated. To further reduce power consumption, FAN6755 uses the BiCMOS process, which allows an operating current of only 2mA. The standby power consumption can be under 100mW for most of LCD monitor power supply designs.

Features

Internal High-Voltage Startup

Low Operating Current (Maximum: 2mA)

Adaptive Decreasing of PWM Frequency to 23KHz at Light-Load condition to Improve Light-Load Efficiency

Frequency Hopping to Reduce EMI Emission

Fixed PWM Frequency: 65KHz

Internal Leading-Edge Blanking

Built-in Synchronized Slope Compensation

Auto-Restart Protection : Feedback Open-Loop Protection (OLP), VDDOver-Voltage Protection (OVP), Over-Temperature Protection (OTP), and Line Over-Voltage Protection

Soft Gate Drive with Clamped Output Voltage: 18V

VDD Under-Voltage Lockout (UVLO)

Programmable Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

Build-in 5ms Soft-Start Function

Input Voltage Sensing (VINPin) for Brown-in/out Protection with Hysteresis and Line Over-Voltage Protection

Applications

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

LCD Monitor Power Supply

Open-Frame SMPS