Datasheet > SG6741_08

SG6741_08

更新时间： 2024-10-28 11:57:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
12页	455K
描述
Highly Integrated Green-Mode PWM Controller

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中文翻译

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SG6741_08 数据手册

October 2008

SG6741

Highly Integrated Green-Mode PWM Controller

Features

Description

The highly integrated SG6741 PWM controller provides

several features to enhance the performance of flyback

converters.

High-Voltage Startup

Low Operating Current: 4mA

Linearly Decreasing PWM Frequency to 22kHz

Frequency Hopping to Reduce EMI Emission

Peak-Current-Mode Control

The highly integrated SG6741 series of PWM

controllers 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. 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, SG6741 is manufactured

using the BiCMOS process, which allows an operating

current of only 4mA.

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking

Synchronized Slope Compensation

Gate Output Maximum Voltage Clamp: 18V

V_DDOver-Voltage Protection (Auto Restart)

V_DDUnder-Voltage Lockout (UVLO)

Internal Open-Loop Protection

Constant Power Limit (Full AC Input Range)

SG6741 integrates a frequency-hopping function 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 range

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Power Adapters

of AC input voltages, from 90V_ACto 264V_AC

Open-Frame SMPS

SG6741 provides many protection functions. In addition

to cycle-by-cycle current limiting, the internal open-loop

protection circuit ensures safety when an open-loop or

output short-circuit failure occurs. PWM output is

disabled until V_DDdrops below the UVLO lower limit;

then the controller starts again. As long as V_DDexceeds

about 26V, the internal OVP circuit is triggered.

SG6741 is available in an 8-pin SOP package.

Ordering Information

Operating

Part Number

Temperature

Range

Package

Packing Method

Eco Status

SG6741SZ

SG6741SY

-40 to +105°C 8-Lead Small Outline Package (SOP)

Green

Tape & Reel

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

SG6741 • Rev. 1.3.3

www.fairchildsemi.com

12 3 4 5 6 7...12

中文翻译

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与SG6741_08相关器件

型号	品牌	获取价格	描述	数据表
SG6741A	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6741ASZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6741SY	FAIRCHILD	获取价格	Highly-Integrated Green-Mode PWM Controller, 8LD, SOIC,JEDEC MS-012, .150" NARROW
SG6741SZ	FAIRCHILD	获取价格	Highly-Integrated Green-Mode PWM Controller
SG6742	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
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

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