Controllers | FAN6755W

Green-Mode PWM Controller for Flyback Converter, 65KHz, Line OVP, Brown In/Out Protection

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Overview

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 reduces switching frequency at light-load condition. To avoid acoustic noise problems, the minimum PWM frequency is set above 23kHz. The 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, FAN6755W/UW uses a 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.
FAN6755W/UW integrates a frequency-hopping function that reduces EMI emission of a power supply with minimum line filters. Its built-in synchronized slope compensation achieves a stable peak-current-mode control and improves noise immunity. The proprietary, external line compensation ensures constant output power limit over a wide AC input voltage range from 90VAC to 264VAC.
FAN6755W/UW provides many protection functions. The internal feedback open-loop protection circuit protects the power supply from an open feedback loop condition or an output short condition. It also has line under-voltage protection (brownout protection) and over-voltage protection using an input voltage sensing pin (VIN).
FAN6755W/UW is available in a 7-pin SOP package.

  • AC-DC Merchant Power Supply
  • LCD Monitor
  • LED TV
  • mWSaver™ Technology Provides Industry's Best-in-Class Standby Power
  • <100mW at 25mW Load for LCDM Adaptor
  • Internal High-Voltage JFET Startup
  • Low Operating Current Maximum: 2mA
  • Adaptive Decreasing of PWM Frequency to 23KHz at Light-Load Condition, Improved Light-Load Efficiency
  • Feedback Impedance Switching During Minimum Load or No Load
  • Proprietary Asynchronous Frequency Hopping Reduced EMI
  • Fixed PWM Frequency: 65KHz (FAN6755W), 130KHz (FAN6755UW)
  • 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
  • Input Voltage Sensing (VIN Pin) for Brown-In/Out Protection with Hysteresis and Line Over-Voltage Protection
  • Build-in 5ms Soft-Start Function

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FAN6755WMY

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Obsolete

CAD Model

Pb

A

H

P

SOIC8 N Missing Pin 7

751EA

1

260

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2500

N

-

-

-

15

17

-

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