Alliance Semiconductor Intros AS80M18xx IC Family
Alliance Semiconductor Corp. (Santa Clara, CA) introduced its new family of spread spectrum ICs designed specifically for switched-mode power supplies (SMPS). The AS80M18xx family is designed to work as companion chips to standard, off-the-shelf pulse-width modulator (PWM) controllers.
The AS80M18xx family for SMPS reduces the electromagnetic interference (EMI) by modulating the PWM gate drive signal to the power MOSFET. By modulating the switching frequency of SMPS, the AS80M18xx family is able to reduce conducted and radiated emissions directly benefiting dc/dc converters, ac/dc inverters and dc/ac inverters. The AS80M18xx family is a simple "drop-in" solution between the PWM controller and the MOSFET for EMI-related problems in SMPS.
The AS80M18xx family currently comprises two devices. The AS80M1800 is designed to work in the range of 50KHz to 400KHz input frequency while the AS80M1801 device is designed to work in the 400KHz to 1MHz input frequency range. Both devices are available in an eight-pin SOIC package, two power saving modes for ultra-low power consumption, and a wide operating voltage range of 7V to 20V.
The AS80M1800 is priced at $0.30 and the AS80M1801 is priced at $0.45 in quantities of 100,000 units. Both devices will be sampling at the end of March 2003.
