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A4949 - Three Phase Sensorless Sinusoidal Fan Driver

Download the A4949 datasheet PDF. This datasheet also covers the A4945 variant, as both devices belong to the same three phase sensorless sinusoidal fan driver family and are provided as variant models within a single manufacturer datasheet.

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.

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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (A4945-Allegro.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

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A4919 Three-Phase MOSFET Driver Allegro MicroSystems
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Other Datasheets by Allegro MicroSystems

Part Number Description
A4942 Three-Phase Sensorless Fan Driver
A4945 Three Phase Sensorless Sinusoidal Fan Driver
A4900 High Voltage Three Phase Gate Driver
A4910 Automotive 3-Phase MOSFET Driver
A4911-1 Automotive Three-Phase MOSFET Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
A4945 and A4949 Three Phase Sensorless Sinusoidal Fan Driver FEATURES AND BENEFITS • 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 PACKAGES: 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. Alternatively, power supply modulation down to 4 V can be used to adjust motor speed.