SG6742

更新时间： 2024-10-28 03:32:27

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
14页	693K
描述
Highly Integrated Green-Mode PWM Controller

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SG6742 数据手册

Product Specification

Highly Integrated Green-Mode PWM Controller

SG6742

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. This

green-mode function enables the power supply to meet

international power conservation requirements. With the

internal high-voltage start-up circuitry, the power loss due

to bleeding resistors is eliminated. To further reduce power

consumption, SG6742 is manufactured using the BiCMOS

process, which allows an operating current of 4mA.

FEATURES

High-voltage start-up

Low operating current (4mA)

Linearly decreasing PWM frequency to 22KHz

Frequency jittering 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

SG6742 integrates a frequency a hopping function that

helps reduce EMI emission of a power supply with

minimum line filters. Also, 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 voltages,

GATE output maximum voltage clamp (18V)

_DDunder-voltage lockout (UVLO)

_DDover voltage protection (OVP)

Programmable over-temperature protection (RT)

Internal latch circuit (OVP, RT)

Constant power limit (full AC input range)

Internal OTP sensor with hysteresis

from 90V_ACto 264V_AC

SG6742 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_DDdrops below the UVLO lower limit when the

controller starts up again. As long as V_DDexceeds about

26V, the internal OVP circuit is triggered.

APPLICATIONS

General-purpose switch-mode power supplies and

flyback power converters, including:

Power Adapters

Open-Frame SMPS

SG6742 is available in an 8-pin DIP or SOP package.

DESCRIPTION

The highly integrated SG6742 series of PWM controllers

provides several features to enhance the performance of

flyback converters.

TYPICAL APPLICATION

Version 1.0.1 (IAO33.0083.B0)

- 1 -

www.sg.com.tw • www.fairchildsemi.com

September 24, 2007

12 3 4 5 6 7...14

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与SG6742相关器件

型号	品牌	获取价格	描述	数据表
SG6742DZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HL	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HL/HR	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HLSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HR	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HR_HL	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742HRSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742ML	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742MLSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742MR	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller

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