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ASM8P18S44ERF-08-MX PDF预览

ASM8P18S44ERF-08-MX

更新时间： 2024-11-23 22:15:59
品牌 Logo 应用领域
ALSC 开关光电二极管控制器
页数 文件大小 规格书
11页 1577K
描述
Voltage Mode PWM Controller with EMI Reduction

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中文翻译

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ASM8P18S44ERF-08-MX 数据手册

 浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第2页浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第3页浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第4页浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第5页浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第6页浏览型号ASM8P18S44ERF-08-MX的Datasheet PDF文件第7页 
ASM8P18S42 / ASM8P18S42ER  
ASM8P1843 / ASM8P18S43ER  
ASM8P18S44ER / ASM8P18S45ER  
June 2005  
rev 0.6  
Voltage Mode PWM Controller with EMI Reduction  
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  
ꢀ 30V maximum operating voltage with CMOS  
technology  
ꢀ Adjustable PWM frequencies (40 KHz to 400 KHz)  
ꢀ Maximum Output drive current of 1A.  
ꢀ Wide duty cycle range (0% minimum to 95%  
maximum)  
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.  
ꢀ Spread spectrum modulation with adjustable spread.  
ꢀ Under voltage lockout with hysteresis.  
ꢀ Low startup current: 275µA maximum  
ꢀ Pin compatible with industry standard 3842 PWM  
controller.  
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.  
ꢀ Temperature range –40°C to +85°C.  
ꢀ Thermal shutdown, overload and undercurrent  
protection.  
ꢀ Frequency skip mode.  
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.  
ꢀ Available in 8-pin plastic MicroSO, P-DIP and SOIC  
packages.  
Applications  
ꢀ Off-line converter  
ꢀ DC-DC converter  
ASM8P18xx provides under voltage lockout, thermal  
shutdown, overload, and undercurrent protection. It is  
available in 8-pin MicroSO, P-DIP and SOIC package.  
ꢀ Monitor power supply  
ꢀ Computer/DVD/STB power supply  
ꢀ Wireless base station power supply  
ꢀ Telecom power supply  
Typical Operating Circuit  
VDD  
VIN  
VDD  
FSEL  
GND  
CT  
ASM8P18xx  
VREF  
OUT  
ISNS  
COMP  
FB  
RD  
R3  
R1  
R2  
CC  
RC  
RS  
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.  
1234567...11

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