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ASM8I18S43ERF-08-PX Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM8I18S43ERF-08-PX Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
1 / 11 page ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER June 2005 ASM8P18S44ER / ASM8P18S45ER rev 0.6 Notice: The information in this document is subject to change without notice. Alliance Semiconductor 2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • Voltage Mode PWM Controller with EMI Reduction 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. Features 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) 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 shutdown, overload and undercurrent protection. Frequency skip mode. Available in 8-pin plastic MicroSO, P-DIP and SOIC packages. 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 VDD VDD VIN FSEL GND CT VREF OUT COMP RC CC R1 R2 From SMPS Output RS ISNS FB RD R3 ASM8P18xx |
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