SG6846G

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	377K
描述
Highly Integrated Green-Mode PWM Controller

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SG6846G 数据手册

October 2008

SG6846G

Highly Integrated Green-Mode PWM Controller

Features

Description

A highly integrated PWM controller, SG6846G 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 continuously decrease the switching

frequency under light-load conditions. Under zero-load

conditions, the power supply enters burst-mode, which

completely shuts off PWM output. Output restarts just

before the supply voltage drops below the UVLO lower

limit. This green-mode function enables power supplies

to meet international power conservation requirements.

Low Startup Current: 8µA

Low Operating Current: 3.7mA

Peak-Current-Mode Operation with Cycle-by-Cycle

Current Limiting

PWM Frequency Continuously Decreasing with

Burst Mode at Light Loads

V_DDOver-Voltage Protection (OVP)

AC Input Brownout Protection with Hysteresis

Constant Output Power Limit (Full AC Input Range)

Internal Latch Circuit for OVP, OTP, and OCP

Two-Level OCP Delay: 110ms

The SG6846G is designed for SMPS with surge-current

output, incorporated with a two-level OCP function.

Besides the cycle-by-cycle current limiting; if the

switching current is higher than OCP threshold and

lasts for 110ms, SG6846G shuts down immediately.

SG6846G also integrates a frequency-hopping function

internally, which helps reduce EMI emission of a power

supply with minimum line filters. The built-in

synchronized slope compensation provides proprietary

internal compensation for constant output power limit

over a universal AC input range. The gate output is

clamped at 18V to protect the external MOSFET from

over-voltage damage.

Programmable PWM Frequency with

Frequency Hopping

OCP Threshold is Half Peak Current Limit

Feedback Open-Loop Protection with 110ms Delay

Soft Startup Time: 5ms

Applications

Other protection functions include AC input brownout

protection with hysteresis and V_DDover-voltage

protection. For over-temperature protection, an external

NTC thermistor can be applied to sense the ambient

temperature. When OCP, V_DDOVP, or OTP are

activated, an internal latch circuit latches off the

controller. The latch resets when V_DDsupply is removed.

General-purpose, switch-mode power supplies and

flyback power converters, including:

Power Adapters

Open-Frame SMPS

SMPS with Surge-Current Output, such as for

Printers, Scanners, Motor Drivers

SG6846G is available in an 8-pin SOP package.

Ordering Information

Part

Number

Operating

Temperature Range Latch

OCP

Packing

Method

Eco

Status

Package

SG6846GLSY

-40 to +105°C

Yes

Green

8-Pin Small Outline Package (SOP) Tape & Reel

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

SG6846G • Rev. 1.0.0

www.fairchildsemi.com

12 3 4 5 6 7...14

中文翻译

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与SG6846G相关器件

型号	品牌	获取价格	描述	数据表
SG6846G_09	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846GLSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846LD	ETC	获取价格	Highly-Integrated Green-Mode PWM Controller
SG6846LDZ	ROCHESTER	获取价格	SWITCHING CONTROLLER, 70kHz SWITCHING FREQ-MAX, PDIP8, ROHS COMPLIANT, MS-001BA, DIP-8
SG6846LS	ETC	获取价格	Highly-Integrated Green-Mode PWM Controller
SG6846LSY	ROCHESTER	获取价格	SWITCHING CONTROLLER, 70kHz SWITCHING FREQ-MAX, PDSO8, GREEN, MS-012AA, SOIC-8
SG6846LSZ	ROCHESTER	获取价格	SWITCHING CONTROLLER, 70kHz SWITCHING FREQ-MAX, PDSO8, ROHS COMPLIANT, MS-012AA, SOIC-8
SG6848	ETC	获取价格	Low Cost Green-Mode PWM Controller for Flyback Converters
SG6848D	FAIRCHILD	获取价格	Switching Regulator/Controller, Current-mode, 75kHz Switching Freq-Max, BICMOS, PDIP8,
SG6848DZ	FAIRCHILD	获取价格	Switching Regulator/Controller, Current-mode, 75kHz Switching Freq-Max, BICMOS, PDIP8,

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