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Full bridge MOSFET predriver is automotive grade

Posted: 29 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET predriver IC? H-bridge MOSFET?


Allegro MicroSystems Inc. has announced a new H-bridge device to complement their existing line of automotive grade MOSFET pre-driver ICs.

Allegro's new device is designed in the latest generation BCD process and includes enhanced features, which make the A3941 well suited for high-temperature automotive systems and industrial systems utilizing a 24V battery. Significant improvements have been made to the fault diagnostics, input logic flexibility and bootstrap charge management.

An area of considerable focus in the automotive market is finding new technologies to replace belt-driven and hydraulic actuators with more efficient systems. Most belt-driven actuators provide a loss to system efficiency even when not in use. Eliminating this older technology is made possible by the adoption of full electronic systems, which use various electric motor technologies to replace the belt driven actuators.

Allegro's A3941 is designed to fit the emerging needs of this market and is capable of driving four external n-channel MOSFETs in a full-bridge configuration. It is typically used in brush DC motor drive applications where high-currents in combination with high ambient temperatures require the use of external MOSFETs.

The device is designed with high-temperature automotive applications and is rated over the full automotive temperature range (-40C to 150C junction temp) and the full battery supply range of 7V to 50V.

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