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A4941 Datasheet Three-Phase Sensorless Fan Driver

Manufacturer: Allegro Micro Systems

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Datasheet Details

Part number A4941
Manufacturer Allegro Micro Systems
File Size 665.21 KB
Description Three-Phase Sensorless Fan Driver
Download A4941 Download (PDF)

General Description

The A4941 three-phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications.

A pulse wave modulated (PWM) input is provided to control motor speed, allowing system cost savings by eliminating external variable power supply.

PWM input can also be used as an on/off switch to disable motor operation and place the IC into a low power standby mode.

Overview

A4941 Three-Phase Sensorless Fan Driver.

Key Features

  • Sensorless (no Hall sensors required).
  • Soft switching for reduced audible noise.
  • Minimal external components.
  • PWM speed input.
  • FG speed output.
  • Low power standby mode.
  • Lock detection.
  • Optional overcurrent protection.
  • Variant A automotive qualified to AEC-Q100 Grade 2.

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