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A3955 Datasheet FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

Manufacturer: Allegro MicroSystems

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General Description

The A3955 is designed to drive one winding of a bipolar stepper motor in a microstepping mode.

The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50V.

Internal pulse width modulated (PWM) current control combined with an internal three-bit nonlinear digitalto-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (microstepping) modes.

Overview

A3955 Full-Bridge PWM Microstepping Motor Driver.

Key Features

  • ±1.5 A continuous output current.
  • 50 V output voltage rating.
  • Internal PWM current control.
  • 3-bit nonlinear DAC.
  • Fast, mixed fast/slow, and slow current-decay modes.
  • Internal transient-suppression diodes.
  • Internal thermal shutdown circuitry.
  • Crossover-current and UVLO protection Packages: Package B, 16-pin DIP with exposed tabs Package LB, 16-pin SOIC with internally fused pins Not to scale.

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