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FAN6753

Highly Integrated Green-Mode PWM Controller

Fairchild Semiconductor 

February 2011

FAN6753

Highly Integrated Green-Mode PWM Controller

Features

 High-Voltage Startup

 Low Operating Current: 2.7mA

 Adaptive Decreasing PWM Frequency to 22KHz

 Built-in Full-Range Frequency Hopping to Reduce

EMI Emission

 Fixed PWM Frequency: 65KHz

 Peak-Current-Mode Control

 Cycle-by-Cycle Current Limiting

 Leading-Edge Blanking (LEB)

 Synchronized Slope Compensation

 Internal Auto-Recovery Open-Loop Protection

 GATE Output Maximum Voltage Clamp: 18V

 VDD Under-Voltage Lockout (UVLO)

 VDD Over-Voltage Protection (OVP),

Auto Recovery / Latch for Option

 Internal Auto-Recovery Sense Short-Circuit

Protection for Option

 Constant Power Limit (Full AC Input Range)

 Internal OTP Sensor with Hysteresis

 Built-in 5ms Soft-Start Function

 Built-in LATCH Pin Pull HIGH (> 5.2V)

Latch Function

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

 Power Adapters

 Open-Frame SMPS

Description

The highly integrated FAN6753 PWM controller provides

several features to enhance the performance of flyback

converters.

To minimize standby power consumption, a proprietary

adaptive green-mode function provides frequency

modulation at light-load conditions. To avoid acoustic-

noise problems, the minimum PWM frequency is set

above 22KHz. This green-mode function enables the

power supply to meet international power conservation

requirements. With the internal high-voltage startup

circuitry, the power loss due to bleeding resistors is also

eliminated. To further reduce power consumption,

FAN6753 is manufactured using the BiCMOS process,

which allows an operating current of only 2.7mA.

FAN6753 integrates a full-range frequency-hopping

function internally that helps reduce EMI emission of a

power supply with minimum line filters. Its built-in

synchronized slope compensation achieves stable peak-

current-mode control. The proprietary internal line

compensation ensures constant output power limit over

a wide AC input voltage range, from 90VAC to 264VAC.

FAN6753 provides many protection functions. In

addition to cycle-by-cycle current limiting, the internal

open-loop protection circuit ensures safety should an

open-loop or output short-circuit failure occur. PWM

output is disabled until VDD drops below the UVLO lower

limit, when the controller starts up again. As long as VDD

exceeds ~26V, the internal OVP circuit is triggered.

Available in the 8-pin SOP package.

Ordering Information

Part Number

FAN6753MY

Operating

Temperature Range

-40C to +105C

Package

8-Lead, Small Outline Package

Packing Method

Tape & Reel

© 2009 Fairchild Semiconductor Corporation

FAN6753 • Rev. 1.0.3

www.fairchildsemi.com

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