Posted to News on 16th Jul 2008, 09:50
Three-phase MOSFET pre-driver IC suits industrial applications
The new A4935 from Allegro MicroSystems Europe is an automotive-grade three-phase MOSFET pre-driver IC targeted at automotive and industrial applications. This third-generation device includes enhanced performance and operational features and is suitable 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.
Allegro MicroSystems is targeting the A4935 at the rapid growth in three-phase brushless DC motor applications in the automotive and industrial sectors. The new device integrates a regulating charge pump that provides full gate drive capability for battery voltages down to 7V and reduced gate drive for battery voltages as low as 5.5V.
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 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-free with 100 per cent matte tin lead frame plating.
To download a copy of the datasheet, click on www.allegromicro.com/en/Products/Part_Numbers/4935/4935.pdf.
