Datasheet > SG6846A_08

SG6846A_08

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
15页	470K
描述
Highly Integrated Green-Mode PWM Controller

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SG6846A_08 数据手册

September 2008

SG6846A

Highly Integrated Green-Mode PWM Controller

Features

Description

The SG6846A is especially 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 two thirds the peak-

current threshold for 1700ms, over-current protection is

activated such that the SG6846A is latched off.

Low Startup Current: 8µA

Low Operating Current: 3.7mA

Peak-Current Mode of Operation with Cycle-by-

Cycle Current Limiting

PWM Frequency Continuously Decreasing with

Burst Mode at Light Loads

If the switching current is higher than two thirds of the

peak-current threshold for 100ms, and the voltage on

the V_DDis still higher than V_DD-OFF+ 1V, the PWM

pulses are latched off immediately once the V_DDvoltage

is lower than V_DD-OFF+ 1V. This is useful when an

output short circuit occurs.

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: 1600ms

SG6846A also integrates a frequency-hopping function

internally to reduce EMI emission of a power supply

with minimum line filters. Its built-in synchronized slope

Output Short-Circuited Delay Time: 100ms

compensation

provides

proprietary

internal

compensation for constant output power limit over

universal AC input range. Also, the gate output is

clamped at 18V to protect the external MOSFET from

over-voltage damage. Internal soft-start is built-in to

soften the stress on the MOSFET and startup current

during power on period.

Programmable PWM Frequency with

Frequency Hopping

OCP Threshold is Half Peak Current Limit

Feedback Open-loop Protection with 1700ms Delay

Built-in Soft-Start

Other protection functions include AC input brownout

protection with hysteresis, V_DDover-voltage protection,

and over-temperature protection. For over-temperature

protection, an external NTC thermistor can be applied to

sense the ambient temperature. When OCP, V_DDOVP,

or OTP is activated, an internal latch circuit latches off

the controller. The PWM pulses stay latched off until the

power supply is disconnected from the mains outlet.

Applications

General-purpose switch-mode power supplies and

flyback power converters, including:

Power Adapters

Open-frame SMPS

SG6846A controller is available in 8-pin SOP package.

SMPS with Surge-current Output, such as for

Printers, Scanners, Motor Drivers

Ordering Information

Part

Number

Operating

Temperature Range Latch

OCP

Packing

Method

Eco

Status

Package

SG6846ALSY

SG6846ACSY

SG6846ALSZ

-40 to +105°C

Yes

Green

RoHS

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

Yes

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

SG6846A • Rev. 1.1.4

www.fairchildsemi.com

12 3 4 5 6 7...15

中文翻译

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与SG6846A_08相关器件

型号	品牌	获取价格	描述	数据表
SG6846ACSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ACSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ALSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846ALSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846B	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BCSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BCSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BLSY	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846BLSZ	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller
SG6846C	FAIRCHILD	获取价格	Highly Integrated Green-Mode PWM Controller

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