FAN6755 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN6755

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

May 2010

FAN6755

Highly Integrated Green-Mode PWM Controller

Features

ƒ Internal High-Voltage Startup

ƒ Low Operating Current (Maximum: 2mA)

ƒ Adaptive Decreasing of PWM Frequency to 23KHz

at Light-Load condition to Improve Light-Load

Efficiency

ƒ Frequency Hopping to Reduce EMI Emission

ƒ Fixed PWM Frequency: 65KHz

ƒ Internal Leading-Edge Blanking

ƒ Built-in Synchronized Slope Compensation

ƒ Auto-Restart Protection : Feedback Open-Loop

Protection (OLP), VDD Over-Voltage Protection

(OVP), Over-Temperature Protection (OTP), and

Line Over-Voltage Protection

ƒ Soft Gate Drive with Clamped Output Voltage: 18V

ƒ VDD Under-Voltage Lockout (UVLO)

ƒ Programmable Constant Power Limit (Full AC

Input Range)

ƒ Internal OTP Sensor with Hysteresis

ƒ Build-in 5ms Soft-Start Function

ƒ Input Voltage Sensing (VIN Pin) for Brown-in/out

Protection with Hysteresis and Line Over-Voltage

Protection

Applications

General-purpose switched-mode power supplies and

flyback power converters, including:

ƒ LCD Monitor Power Supply

ƒ Open-Frame SMPS

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.

FAN6755 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.

FAN6755 provides many protection functions. The

internal feedback open-loop protection circuit protects

the power supply from open feedback loop condition or

output short condition. It also has line under-voltage

protection (brownout protection) and over-voltage

protection using an input voltage sensing pin (VIN).

FAN6755 is available in a 7-pin SOP package.

Ordering Information

Part Number

Operating

Temperature Range

Package

Packing Method

FAN6755MY

-40 to +105°C

7-Lead, Small Outline Integrated Circuit (SOIC),

Depopulated JEDEC MS-112, .150 Inch Body

Reel & Tape

ENERGY STAR® is a registered trademark of the U.S. Department of Energy and the U.S. Environmental Protection Agency.

© 2009 Fairchild Semiconductor Corporation

FAN6755 • Rev. 1.0.1

1

www.fairchildsemi.com

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