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Controllers take hold of EMI

Posted: 15 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:alliance semiconductor? pulse-width-modulator controller? pwm controller? asm8p18xx? electromagnetic interference?

Alliance Semiconductor's newest family of pulse-width-modulator (PWM) controllers, the ASM8P18xx, in four basic versions for switchmode supply and inverter applications, includes user-configurable spread spectrum modulation circuitry to reduce electromagnetic interference (EMI).

Billed as the industry's first such EMI reduction ICs for switchmode supplies, the 30V CMOS devices deliver up to 1A. Features include adjustable PWM frequency, selectable from 40kHz to300 kHz; low startup current (275?A maximum); duty cycle range from zero to 95 percent; under-voltage lockout with hysteresis; and thermal shutdown, overload and under-current protection.

These chips are pin-compatible with the industry standard 3842 PWM controller (in general, the 184x-384x types).

The ASM8P18S42-45, available in thirty-six versions to meet specific start-up, maximum duty-cycle, operating temperature and packaging requirements, are available in both 8-pin DIPs and SOICs. They're available in commercial and industrial temperature grades, and with standard tin-lead or as RoHS and/or green-compliant products. The controllers are initially priced at $2 each in 1,000 quantities.

- Vincent Biancomano


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