Automotive grade pre-driver IC targets motors
The A4933 automotive-grade three-phase MOSFET pre-driver IC targets BLDC motors commonly found in electronic power steering systems, engine cooling fans, transmission actuators and hydraulic pumps. It targets three-phase systems and is used in systems that use sinusoidal control of the motor phase currents. The pre-driver reduces audible noise and minimizes torque ripple at the load.
The pre-driver IC features 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. It also has a top-off charge pump that enables 100% pulse-width-modulation, an adjustable dead-time, an adjustable drain-to-source monitor, and fault diagnostics. The IC is available in a 48L eLQFP package with an exposed pad. ($3.07 ea/1,000 available now.)
By Paul O’Shea
Allegro MicroSystems , Worcester , MA
Sales 508-853-5000
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