By Allegro MicroSystems, LLC 44
Allegro MicroSystems' A4992 is a flexible microstepping motor driver with integrated phase current control and a built-in translator for easy operation. It is a single-chip solution designed to operate bipolar stepper motors in full-, half-, quarter- and eighth-step modes, at up to 28 V. At power-on the A4992 is configured to drive most small stepper motors with simple-step and direction inputs.
The current regulator operates with fixed-frequency PWM and uses adaptive mixed-current decay to reduce audible motor noise and increase step accuracy.
The current in each phase of the motor is controlled through a DMOS full-bridge using synchronous rectification to improve power dissipation. Internal circuits and timers prevent cross conduction and shoot-through when switching between high and low-side drives.
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