42 V MOSFET controller IC

22 October 2003 Analogue, Mixed Signal, LSI

The A3925 power MOSFET controller IC from Allegro MicroSystems is designed for use in 42 V automotive applications involving high-power motors. This device provides six high-current gate-drive outputs capable of driving a wide range of power N-channel MOSFETs. Bootstrap capacitors are used to provide a steady supply voltage over a varying battery input range: a key requirement in automotive systems. Direct control of each gate output is possible via six TTL compatible inputs. A differential amplifier with two sample-and-hold outputs is integrated to allow accurate measurement of the low-side current in a 3-phase bridge. Two diagnostic fault outputs can be continuously monitored to protect the driver from short circuits to battery or supply, bridge-open, all undervoltage conditions, and thermal shutdown.

Memec SA, 011 897 8600

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