Datasheet > SC1103_05

SC1103_05

更新时间： 2024-11-17 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	200K
描述
Asynchronous Voltage Mode PWM Controller for 12V Input

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SC1103_05 数据手册

SC1103

Asynchronous Voltage Mode PWM

Controller for 12V Input

POWER MANAGEMENT

Features

Description

The SC1103 is a versatile, low-cost, voltage-mode PWM

controller designed for 12V input DC/DC power supply

applications. A simple, fixed-voltage buck regulator can

be implemented using the SC1103 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.

Low cost / small size

Switch mode efficiency up to 95%

1% reference voltage accuracy

Over current protection

500mA output drive

5V to 12V Input power source

Lead free package available. Fully WEEE and RoHS

compliant

SC1103 features include a temperature compensated

voltage reference, triangle wave oscillator, current limit

comparator, frequency shift over-current protection, and

an internally compensated error amplifier. Pulse by pulse

current limiting is implemented by sensing the

differential voltage across an external resistor, or an

appropriately sized PC board trace.

Applications

Pentium® P55 Core Supply

Low Cost Microprocessor Supplies

Peripheral Card Supplies

Industrial Power Supplies

High Density DC/DC Conversion

The SC1103 operates at a fixed frequency of 200kHz,

providing an optimum compromise between efficiency,

external component size, and cost.

Typical Application Circuit

Vout = 2.5V @ 10A

6uH

IRLR3103

0.05

+12V

127*see note

C11

1.0

220/4V

C10

220/4V

1.0

MBRD1035L

127

47/16V

GND

+20V

SC1103

0.01

2.2

VCC

GND

CS(-)

CS(+)

PGND

0.1

0.001

BST

0.1

* NOTE:

R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value

12V to 3.3V @ 10A with “flying capacitor” boost voltage.

www.semtech.com

Revision: July 28, 2005

12 3 4 5 6 7

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