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Allegro intros bipolar stepper, DC motor driver

Posted: 09 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:bipolar stepper? DC motor? motor driver? Allegro? mixed decay?

A3989 bipolar stepper, DC motor driver from Allegro

Allegro MicroSystems Inc. has announced a new DMOS bipolar stepper and DC motor driver designed to drive one bipolar stepper motor at up to 1.2A and one DC motor at up to 2.4A. Capable of drive voltages up to 36V, the A3989 includes a fixed off-time current regulator for each of the three full-bridges.

The two stepper motor full-bridges feature the company's patented mixed decay mode. This current decay control scheme results in reduced audible motor noise, increased step accuracy and reduced power dissipation. The DC motor full-bridge current regulator operates in either fast or slow decay mode, determined by the MODE input.

Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. PHASE, ENABLE and MODE inputs are provided for use in controlling the speed, torque, direction and brake or coast functions of a DC motor. The stepper motor is controlled with PHASE, I0 and I1 inputs for full-, half- or quarter-step operation. Protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power-up sequencing is not required.

The A3989 is supplied in a Pb-free 36L QFN package with exposed power tab for enhanced thermal dissipation. It has a 6-by-6mm footprint and 0.90mm nominal height.




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