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AC switch cuts component count by 80%

Posted: 22 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? alternating current switch? AC load? appliance? Application Specific Device?

STMicroelectronics (ST) has introduced a generation of alternating current switches (ACS) to control the numerous AC loads employed by appliance applications. Designed to drive pumps, fans, valves, relays, dispensers, door locks and micro-motors in appliances such as dishwashers, air conditioners, washing machines, dryers, refrigerators, ovens and freezers, the ACSes provide designers with higher voltage capability while ensuring overall system efficiency.

The 600V-rated ACS family of switches is built with ST's proprietary Application Specific Devices (ASD) process technology, which enables the integration of both over-voltage protection circuitry and RC-snubber external components. The ACS family helps users save space within electronic boards while meeting the requirements of the latest home-appliance energy-saving and EMC standard for testing and measurement techniques such as IEC 61000-4-5.

An advancement over the previous ACS102-5Tx and ACS108-5Sx, the ACS102-6Tx and ACS108-6Sx switches include improved static and dynamic characteristics. Among these, the latching and holding current levels have been reduced by 50 percent, allowing a more optimized gate pulse-control mode, especially in case of lower power rated loads. This drastically reduces power consumption, ST said. The switching capabilities and the electrical noise immunity have also been improved by about 15 percent, compared to the previous version.

ST added that designers using the new ACSes will be able to cut the cost of their appliances by reducing component count up to 80 percent and by avoiding external over-voltage suppressors. Appliance design will also be simplified by enabling the ACSes to be directly driven from microcontrollers, added the company.

The ACS102 is available in both TO-92 and SO-8 ECOPACK packages, while the ACS108 is housed in TO-92 and SOT-223 ECOPACK packages. Already in production, the ACS102 and ACS108 are priced at 23 cents and 25 cents, respectively, in 10,000-unit orders.

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