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A4949 Datasheet Three Phase Sensorless Sinusoidal Fan Driver

Manufacturer: Allegro MicroSystems

Download the A4949 datasheet PDF. This datasheet also includes the A4945 variant, as both parts are published together in a single manufacturer document.

📥 Download Datasheet

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

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
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
A4911-1A Automotive Three-Phase MOSFET Driver
A4918-1A Automotive Three-Phase MOSFET Driver
A4923 3-Phase Sinusoidal Motor Controller
A4926 Automotive Half-Bridge MOSFET Driver
A4927 Automotive Half-Bridge MOSFET Driver