Allegro® Announces New DMOS Microstepping Motor Driver with Built-In Translator

Allegro® Announces New DMOS Microstepping Motor Driver with Built-In Translator

Allegro® announces a new A4983 is a DMOS microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4983 includes a fixed off-time current regulator, which has the ability to operate in slow or mixed decay modes. This new motor driver is targeted toward the office automation, industrial and medical markets.

For Applications with Limited Board Space

The chopping control in the A4983 automatically selects the current decay mode (slow or mixed). When a signal occurs at the STEP input pin, the A4983 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to slow decay. If the change is to a lower current, then the current decay is set to mixed (set initially to a fast decay for a period amounting to 31.25% of the fixed off-time, then to a slow decay for the remainder of the off-time). This current decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.