FAN6755

FAN6755 — Highly Integrated Green-Mode PWM Controller February 2010 FAN6755 Highly Integrated Green-Mode PWM Controller Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ 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), VDD Over-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 (VIN Pin) for Brown-in/out Protection with Hysteresis and Line Over-Voltage Protection 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 acousticnoise 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 resisto...