ASM8I1843F-08-MX ALSC [Alliance Semiconductor Corporation], ASM8I1843F-08-MX Datasheet

ASM8I1843F-08-MX

Manufacturer Part Number

ASM8I1843F-08-MX

Description

Voltage Mode PWM Controller with EMI Reduction

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.ASM8I1843F-08-MX.pdf (11 pages)

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June 2005

rev 0.6

General Description

ASM8P18xx is a high performance, adjustable frequency,

PWM controller with an integrated spread spectrum

modulator for EMI reduction. It contains all the functions

of a standard PWM controller along with a user

configurable spread spectrum modulation with adjustable

spread. ASM8P18xx allows significant system cost

savings by reducing the number of PCB layers and

shielding that are traditionally required to pass EMI

regulation.

ASM8P18xx is the industry’s first general purpose EMI

reduction IC, specifically designed for use in SMPS

systems. ASM8P18xx is compatible to any other 3842

PWM controllers.

ASM8P18xx is capable of driving 1A maximum current

output and it covers a wide supply voltage range from 7V

DC to 30V DC. The PWM frequency is selectable from 40

KHz to 400 KHz.

ASM8P18xx provides under voltage lockout, thermal

shutdown, overload, and undercurrent protection. It is

available in 8-pin MicroSO, P-DIP and SOIC package.

Typical Operating Circuit

2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 •

Voltage Mode PWM Controller with EMI Reduction

Notice: The information in this document is subject to change without notice.

FSEL

GND

COMP

Alliance Semiconductor

REF

ASM8P18xx

OUT

Features

Applications

SNS

30V

technology

Adjustable PWM frequencies (40 KHz to 400 KHz)

Maximum Output drive current of 1A.

Wide duty cycle range (0% minimum to 95%

maximum)

Spread spectrum modulation with adjustable spread.

Under voltage lockout with hysteresis.

Low startup current: 275?A maximum

Pin compatible with industry standard 3842 PWM

controller.

Temperature range –40°C to +85°C.

Thermal

protection.

Frequency skip mode.

Available in 8-pin plastic MicroSO, P-DIP and SOIC

packages.

Off-line converter

DC-DC converter

Monitor power supply

Computer/DVD/STB power supply

Wireless base station power supply

Telecom power supply

From SMPS Output

maximum

ASM8P18S44ER / ASM8P18S45ER

shutdown,

ASM8P18S42 / ASM8P18S42ER

ASM8P1843 / ASM8P18S43ER

operating

overload

voltage

and

with

undercurrent

CMOS

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