SC1104B

更新时间： 2024-09-21 04:05:35

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
7页	130K
描述
Simple, Synchronous Voltage Mode PWM Controller

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SC1104B 数据手册

SC1104A/B

Simple, Synchronous

Voltage Mode PWM Controller

PRELIMINARY

POWER MANAGEMENT

ꢀeatures

Description

The SC1104A/B is a versatile voltage-mode PWM con-

troller designed for use in single ended DC/DC power

supply applications. A simple, fixed frequency high effi-

ciency buck regulator can be implemented using the

SC1104A/B with a minimum of external components.

Internal level shift and drive circuitry eliminates the need

for an expensive P-channel, high-side switch. The small

device footprint allows for compact circuit design.

u +5V or +12V operation

u High efficiency (>90%)

u 1% Reference voltage accuracy

u Hiccup mode over current protection

u Robust output drive

u R_DS(ON)Current sensing

u Industrial temperature range

u SO-8 package

SC1104A/B features include temperature compensated

voltage reference, triangle wave oscillator, current limit

comparator and an externally compensated error

amplifier. Current limit is implemented by sensing the

Applications

u Termination supplies

voltage drop across the top ꢀETs R_DS(ON).

u Low cost microprocessor supplies

u Peripheral card supplies

The SC1104A/B operates at a fixed frequency of 300/

600 kHz, providing an optimum compromise between

efficiency, external component size, and cost. 600kHz

switching frequency is typically reserved for the 5V

operation only.

u Industrial power supplies

u High density DC/DC conversion

SC1104A/B has a thermal protection circuit, which is

activated if the junction temperature exceeds 150°C.

Typical Application Circuit

Typical Distributed Power Supply

0.1

220-680pF

47/16V

10.0

47/16V

Vin 5 to 12V

MBRA130L

SC1104A/B

0.01

2.32k

COMP/SS

SENSE

VCC

1.00k

GND

200-1k

0.1-0.22

PHASE

BST

Si4884DY

0.1

1-5.1

1.5-3uH

Si4874DY

1-5.1

(opt)

C10

220/4V

C11

220/4V

C12

220/4V

C13

220/4V

C14-17

3.3V

1.0

ꢀigure 1

www.semtech.com

Revision 3, October 2001

12 3 4 5 6 7

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