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A4945 Datasheet Three Phase Sensorless Sinusoidal Fan Driver

Manufacturer: Allegro MicroSystems

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General Description

The A4945 and A4949 three phase motor drivers incorporate sinusoidal drive to minimize audible noise and vibration for medium power fans.

A Speed input is provided to control motor speed.

This allows system cost savings by eliminating an external variable power supply.

Overview

A4945 and A4949 Three Phase Sensorless Sinusoidal Fan Driver.

Key Features

  • 180° sinusoidal drive for low audible noise.
  • High efficiency control algorithm.
  • Sensorless operation.
  • Analog Speed input (A4945).
  • PWM Speed input (A4949).
  • Wide supply voltage range.
  • FG speed output.
  • Lock detection.
  • Overcurrent protection.
  • Soft start.
  • Short circuit protection.

More Datasheets from Allegro MicroSystems

Part Number Description
A4942 Three-Phase Sensorless Fan Driver
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