BLDC Driver Needs No Sensor

Allegro MicroSystems automotive version of the A5932 sensor-less three-phase BLDC motor controller targets 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. 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 startup to quietly start up and gradually ramp up the motor to the desired speed. This new device has a 5.5 to 50 input voltage rating with an operating range of -40° to 150°C.

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The A5932 is available in a 24-contact 4 mm × 4 mm 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 A5932GESSR-T is priced at $3.456 and the A5932GLPTR-T is priced at $3.792, each/1,000. Need more detsils and specs? Download yourselves an A5932 datasheet.

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