ASM8P18S42ER

June 2005 rev 0.6 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER 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. 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 protection. Frequency skip mode. Available in 8-pin plastic MicroSO, P-DIP and SOIC packages. shutdown, overload and undercurrent www.DataSheet4U.com 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...