Tuesday, July 15, 2008

Allegro MicroSystems Europe A4935 automotive-grade 3-phase MOSFET pre-driver IC

The A4935 is targeted at the rapid growth in 3-phase brushless DC motor applications in the automotive and industrial sectors.

This third-generation device includes enhanced performance and operational features, and is ideal for systems that use sinusoidal control of the motor phase currents. This commutation method provides smooth operation, reducing audible noise and minimising torque ripple at the load.   

The new device integrates a regulating charge pump which provides full gate drive capability for battery voltages down to 7 V and reduced gate drive for battery voltages as low as 5.5 V.

Also included are performance enhancements of the current sense amplifier, as well as better fault diagnostics and reporting to decode and identify faults. Features such as top-off charge pump and bootstrap charge management make the A4935 much easier to manage in terms of ensuring an adequate bootstrap capacitor charge under varying PWM conditions.

Other features include cross-conduction protection with adjustable dead time and a low-current 'sleep' mode.

The A4935KJP-T is supplied in a small-footprint 48L eLQFP small profile thermally efficient exposed-pad package which is lead (Pb) free with 100% matte tin leadframe plating.

More information: www.allegromicro.com

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