SG6742HL

更新时间： 2024-10-28 06:11:23

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
13页	706K
描述
Highly Integrated Green-Mode PWM Controller

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数据手册

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SG6742HL 数据手册

April 2009

SG6742HL/HR

Highly Integrated Green-Mode PWM Controller

Features

Description

The highly integrated SG6742HL/HR PWM controller

provides several features to enhance the performance

of flyback converters.

High-Voltage Startup

Low Operating Current: 2.7mA

Linearly Decreasing PWM Frequency to 22KHz

Frequency Hopping to Reduce EMI Emission

Fixed PWM Frequency: 100KHz

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 eliminated. To further

reduce power consumption, SG6742HL/HR is

manufactured using the BiCMOS process, which allows

an operating current of 2.7mA.

Peak-Current-Mode Control

Cycle-by-Cycle Current Limiting

Leading-Edge Blanking (LEB)

Synchronized Slope Compensation

Internal Open-Loop Protection

GATE Output Maximum Voltage Clamp: 18V

V_DDUnder-Voltage Lockout (UVLO)

V_DDOver-Voltage Protection (OVP)

Programmable Over-Temperature Protection (OTP)

Internal Latch Circuit (OVP, OTP)

Internal-Sense, Short-Circuit Protection

Built-in 6ms Soft-Start Function

SG6742HL/HR integrates a frequency-hopping function

internally 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 AC

input voltage range, from 90V_ACto 264V_AC

SG6742HL/HR 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_DD

exceeds ~25V, the internal OVP circuit is triggered.

Constant Power Limit (Full AC Input Range)

Internal OTP Sensor with Hysteresis

Applications

SG6742HL/HR is available in an 8-pin SOP package.

General-purpose switch-mode power supplies and

flyback power converters, including:

Power Adapters

Open-Frame SMPS

Ordering Information

Operating

Temperature

Range

Part

Number

OLP

Function

Packing

Method

Eco

Status

Package

SG6742HLSY

SG6742HRSY

-40 to +105°C

Latch

8-Lead Small Outline Package (SOP)

Green

Tape & Reel

Restart 8-Lead Small Outline Package (SOP)

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

SG6742HL/HR • Rev. 1.0.4

www.fairchildsemi.com

12 3 4 5 6 7...13

中文翻译

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与SG6742HL相关器件

型号	品牌	获取价格	描述	数据表
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
SG6742MRSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6742SZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller

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