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A4941 - Three-Phase Sensorless Fan Driver

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.

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.

📥 Download Datasheet

Datasheet Details

Part number A4941
Manufacturer Allegro Micro Systems
File Size 665.21 KB
Description Three-Phase Sensorless Fan Driver
Datasheet download datasheet A4941 Datasheet

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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.

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A4941 Three-Phase Sensorless Fan Driver FEATURES AND BENEFITS • 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 PACKAGE: 16-pin TSSOP with exposed thermal pad (suffix LP) 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.