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A5940 Datasheet Three Phase Sensorless Sinusoidal Fan Driver

Manufacturer: Allegro MicroSystems

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General Description

The A5940 three phase motor driver incorporates sinusoidal drive to minimize audible noise and vibration for medium power fans.

A sinusoidal voltage profile is applied to the windings of the motor at startup to quietly startup and gradually ramp up the motor to desired speed.

The voltage profile is selectable via SOFTST pin to allow proper operation with a wide range of motor characteristics.

Overview

A5940 Three Phase Sensorless Sinusoidal Fan Driver.

Key Features

  • AEC-Q100 qualified (K version).
  • Sinusoidal drive for low audible noise.
  • Minimum speed function.
  • Quiet startup adjustment feature.
  • High efficiency control algorithm.
  • Sensorless operation.
  • PWM speed input.
  • FG speed output.
  • Lock detection.
  • Short circuit protection (OCP).
  • Overcurrent limit (OCL).

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