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Allegro offers power-management ICs for low-power SMPS apps

Posted: 19 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:str-a61xx? power-management ic? allegro microsystems? prc? pulse ratio control?

Incorporate an auto-standby functionThe STR-A61xx Series of power-management ICs from Allegro MicroSystems are PRC (pulse ratio control) topology devices designed for use in relatively low output power switch-mode power-supply designs with output power up to 20W at universal input or 24W at 230Vac input.

The PRC operates with fixed off-time and variable on-time, and the devices incorporate an auto-standby function which reduces input power consumption to

Each device incorporates a controller chip based on a proprietary high-voltage BCD process, and a power MOSFET which is available in voltage ratings from 500V to 800V, input voltages of 120V, 230V or universal, and power outputs from 12W to 24W. The entire circuit is housed in a DIP-8 package using hybrid assembly technology. An integrated start-up circuit reduces the input power consumption and improves the system efficiency at light output loads. The use of an avalanche-guaranteed MOSFET also improves system-level reliability and does not require voltage derating.

Target applications include battery chargers for portable consumer electronics appliances, standby power supplies for PCs, TV and audio systems, and low-power supplies for inkjet printers, DVDs and other home appliances.

- Henri Arnold
Electronics Express Europe

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