Tuesday, July 26, 2011
Worcester, MA – Allegro announces a new automotive grade three phase MOSFET pre-driver IC targeted at BLDC motors commonly found in electronic power steering systems, engine cooling fans, transmission actuators and hydraulic pumps. Allegro’s A4933 is primarily targeted at extreme applications where high power, high torque and high temperature combine to require a MOSFET pre-driver that is able to deliver large MOSFET gate drive and switching capabilities.
The A4933 is targeted towards three-phase systems, and in particular, is most often adopted in systems which use sinusoidal control of the motor phase currents. This commutation method provides smooth operation, which reduces audible noise and mini¬mizes torque ripple at the load. Key features include: an integrated charge pump that provides full gate drive for battery voltages (Vbb) down to 7 V and reduced gate drive battery voltages as low as 5.5 V, a top-off charge pump (TOCP) that enables 100% pulse-width-modulation (PWM), an adjustable dead-time that can be regulated by the user, an adjustable drain-to-source monitor (VDSTH), and improved fault diagnostics that enhances the user’s ability to decode and identify faults.
The A4933KJPTR-T is available in a 48L eLQFP small profile, thermally-efficient package with exposed pad.