Automotive sinusoidal sensorless BLDC fan driver IC is low noise option

Allegro MicroSystems Europe announces the automotive version of its A5932. The sensorless BLDC controller is a three-phase BLDC motor controller that is targeted at high-power automotive fan applications with very low vibration and audible noise requirements. MOSFET gate driver outputs permit motor currents that can be scaled to fit the application’s requirements. There is a GUI for fast evaluation and to shorten time to market, says Allegro. Key automotive applications include seat, battery, infotainment and headlamp cooling fans.  

The motor speed is controlled by applying a duty cycle command to the speed (SPD) input. The SPD input is allowed to operate over a wide frequency range. A sinusoidal voltage profile is applied to the windings of the motor at start-up to quietly start and gradually ramp up the motor to the desired speed. This automotive BLDC controller has a 5.5 to 50V input rating with an operating range of -40 to +150 degree C.

The A5932 is available in a 24-contact 4.0 x 4.0mm QFN with exposed thermal pad (suffix ES), and a 24-lead TSSOP with exposed thermal pad (suffix LP). The QFN package is supplied in a wettable flank allowing visual PCB solder inspection. The packages are lead (Pb) free, with 100% matt-tin leadframe plating.

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