sg6742ml Fairchild Semiconductor, sg6742ml Datasheet

sg6742ml

Manufacturer Part Number

sg6742ml

Description

Sg6742ml/mr Highly Integrated Green-mode Pwm Controlle

Manufacturer

Fairchild Semiconductor

Datasheet

1.SG6742ML.pdf (13 pages)

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SG6742ML/MR • Rev. 1.0.3

SG6742ML/MR

Highly Integrated Green-Mode PWM Controller

Features

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Ordering Information

SG6742MRSY

SG6742MLSY

Number

For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

High-Voltage Startup

Low Operating Current: 2.7mA

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

Synchronized Slope Compensation

Internal Open-Loop Protection

GATE Output Maximum Voltage Clamp: 18V

Programmable Over-Temperature Protection (OTP)

Internal Latch Circuit (OVP, OTP)

Internal Sense Short-Circuit Protection

Build-in 5ms Soft-Start Function

Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

Power Adapters

Open-Frame SMPS

Part

Under-Voltage Lockout (UVLO)

Over-Voltage Protection (OVP)

Temperature

-40 to +105°C

Operating

Range

Function

Restart

Latch

OLP

8-Lead Small Outline Package (SOP)

Description

The highly integrated SG6742ML/MR 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

linearly decrease the switching frequency at light-load

conditions. To avoid acoustic-noise problems, the

minimum PWM frequency is set above 22KHz. The

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

manufactured using the BiCMOS process, which allows

an operating current of only 2.7mA.

SG6742ML/MR integrates a frequency-hopping function

that helps reduce EMI emission of a power supply with

minimum line filters. Its built-in synchronized slope

compensation

control. The proprietary, internal line compensation

ensures constant output power limit over a wide AC

input voltage range, from 90V

SG6742ML/MR 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 V

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

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

SG6742ML/MR is available in an 8-pin SOP package.

Package

power

achieves

consumption,

drops below the UVLO lower

stable

Status

Green

to 264V

Eco

SG6742ML/MR

peak-current-mode

December 2008

Tape & Reel

Packing

Method

www.fairchildsemi.com

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