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Allegro MicroSystems, Inc. announces a dual full-bridge pulse-width modulated (PWM) motor driver that is designed to drive both windings of a two-phase bipolar stepper motor. The device includes two H-bridges capable of continuous output currents of 𫗲 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated, current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a user selectable blanking window that prevents false triggering of the PWM current control circuitry during switching transitions

Allegro MicroSystems, Inc.