September 2009

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN6754 • Rev. 1.0.0

FAN6754

Highly Integrated Green-Mode PWM Controller

Brownout and Constant Power Limited by HV Pin

Features

High-Voltage Startup

AC Input Brownout Protection with Hysteresis

Low Operating Current: 1.7mA

Linearly Decreasing PWM Frequency to 22KHz

Frequency Hopping to Reduce EMI Emission

Fixed PWM Frequency: 65KHz

Peak-Current-Mode Control

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking (LEB)

Internal Open-Loop Protection

GATE Output Maximum Voltage Clamp: 13V

Programmable Over-Temperature Protection (OTP)

Internal Latch Circuit (OVP, OTP)

Open-Loop Protection (OLP); Restart for MR, Latch

for ML

Built-in 8ms Soft-Start Function

Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Power Adapters

Description

The highly integrated FAN6754 PWM controller

provides several features to enhance the performance

of flyback converters. To minimize standby power

consumption,

a

proprietary

green-mode

function

provides off-time modulation to continuously decrease

the switching frequency under light-load conditions.

Under

zero-load

and

very light-load

conditions,

FAN6754 saves PWM pulses by entering deep burst

mode. This burst mode function enables the power

supply to meet international power conservation

requirements.

FAN6754 integrates a frequency-hopping function

internally to reduce EMI emission of a power supply

with minimum line filters. Built-in synchronized slope

compensation is accomplished by, proprietary internal

compensation for constant output power limit over

universal AC input range. Also, the gate output is

clamped at 13V to protect the external MOSFET from

over-voltage damage.

Other protection functions include AC input brownout

protection. For over-temperature protection, an external

NTC thermistor can be applied to sense the external

activated, an internal latch circuit is used to latch-off the

is removed.

FAN6754 is available in an 8-pin SOP package.

Ordering Information

Part Number

Operating

Temperature Range

Eco

Status

Package

Packing Method

FAN6754MRMY

-40 to +105°C

RoHS

8-Pin, Small Outline Package (SOP)

Tape & Reel

FAN6754MLMY

-40 to +105°C

RoHS

8-Pin, Small Outline Package (SOP)

Tape & Reel