SC4911IMSTR

更新时间： 2024-02-14 01:44:48

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
14页	217K
描述
Bias/Primary Side PWM Controller with Ultra Low Start-up Current

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SC4911IMSTR 数据手册

SC4911

Bias/Primary Side PWM Controller

with Ultra Low Start-up Current

POWER MANAGEMENT

Description

Features

The SC4911 is a highly integrated bias/primary side PWM Programmable switching frequency up to 500kHz

controller designed for off-line or isolated dc-dc convert-

ers in telecommunication and data communication ap-

plications. The high degree of integration minimizes the

amount of discrete parts needed and leads to substan-

tial cost and space saving converter designs.

Line UVLO Protection

Undervoltage Lockout

Low startup current (45µA)

Cycle by cycle current limit

8 pin MSOP. Available in Lead-free, fully WEEE and

RoHS compliant

The circuitry of the SC4911 includes line voltage UVLO

featuring startup current less than 50µA and program-

mable switching frequency. The device supply is derived

from an auxiliary winding on the transformer. The auxil-

iary winding could also provide output feedback informa-

tion if an optocoupler is not used.

Applications

Telecom isolated converters

Offline isolated power supplies

Instrumentation power supplies

Battery chargers

Typical Application Circuit

Vout

Vin

U1 SC4911

OUT

COMP

ILIM

Revision: April 5, 2006

www.semtech.com

12 3 4 5 6 7...14

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