ASM8P18S44ERF-08-Mx Datasheet
Voltage Mode PWM Controller With EMI Reduction
Download: ASM8P18S44ERF-08-Mx Datasheet 
ASM8P18S44ERF-08-Mx
Voltage Mode PWM Controller With EMI Reduction
June 2005 rev 0.6
ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER
ASM8P18S44ER / ASM8P18S45ER
General
Description
FEATURES
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.
Applications
Off-line Converter Dc-dc Converter Monitor Power Supply Computer/dvd/stb Power Supply Wireless Base
station power supply Telecom power supply
Typical Operating Circuit
CT GND
ASM8P18xx
OUT FB ISNS
R1 RC CC
From SMPS Output
Alliance Semiconductor 2575 Augustine Drive
Santa Clara, CA
Tel: 408.855.4900
Fax: 408.855.4999
Notice: The information in this document is subject to change without notice.
June 2005
rev 0.6
Logic Block Diagram
ISNS FSEL
OL + UC SENSE
THERMAL SHUTDOWN
VDD PWM