SGP400 Fairchild Semiconductor, SGP400 Datasheet

SGP400

Manufacturer Part Number

SGP400

Description

Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback

Manufacturer

Fairchild Semiconductor

Datasheet

1.SGP400.pdf (15 pages)

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Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback

FEATURES

APPLICATIONS

Low-power flyback power converters, such as:

TYPICAL APPLICATION

Version 1.0.1 (IAO33.0084.B0)

Linearly decreasing PWM frequency

Green-mode under light-load and zero-load

conditions

Constant voltage (CV) and constant current (CC)

No secondary feedback

Low start-up current (8µA)

Low operating current (3.6mA)

Leading-edge blanking

Constant power limit

Universal AC input range

Synchronized slope compensation

140°C OTP sensor with hysteresis

Cycle-by-cycle current limiting

Under-voltage lockout (UVLO)

Fixed PWM frequency with hopping

Gate output maximum voltage clamped at 17V

Small SOT-26 package

Battery chargers for cellular phones, cordless phones,

PDAs, digital cameras, and power tools

Power adapters for ink jet printers, video game

consoles, and portable audio players

Open-frame SMPS for TV/DVD standby and other

auxiliary supplies, home appliances, consumer

electronics, and PC 5V standby-power

Replacements for linear transformers and

RCC SMPS

over-voltage clamping

V D D

GN D

SE N SE

G ATE

Q 1

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DESCRIPTION

This highly integrated PWM controller provides several

features to enhance the performance of low-power

flyback converters. To minimize standby power

consumption, the proprietary green-mode function

provides off-time modulation to linearly decrease the

switching frequency under light-load and zero-load

conditions. This green-mode function enables the power

supply to meet international power conservation

requirements. The supply voltage, V

feedback compensation, to regulate the output voltage

without requiring a conventional TL431 and a

photo-coupler. The typical start-up current is only 8µA,

while the typical operating current can be as low as

3.6mA. A large start-up resistance could be used to

achieve even higher power conversion efficiency.

SGP400 integrates a frequency hopping function, which

helps reduce EMI emission of a power supply with

minimum line filters. Built-in synchronized slope

compensation

current-mode control. Proprietary internal compensation

ensures constant output power limiting over a universal

range of AC input voltages, from 90V

Pulse-by-pulse current limiting ensures a constant output

current, even if a short-circuit occurs. Also, the internal

protection circuit disables PWM output if V

22.7V. The gate output is clamped at 16.7V to protect the

power MOS from over-voltage damage. The built-in

over temperature protection (OTP) function shuts down

the controller at 140°C with a 30°C hysteresis. The

SGP400, designed to provide a low-cost total solution for

flyback converters, is available in a small footprint, 6-pin,

SOT-26 package.

A U X

www.sg.com.tw • www.fairchildsemi.com

maintains

the

Product Specification

stability

September 24, 2007

www.DataSheet4U.com

, is also used for

to 264V

SGP400

exceeds

peak

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