Allegro MicroSystems A3984
The A3984 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3984 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.| Part No. | A3984 |
|---|---|
| Datasheet | A3984 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | DMOS Microstepping Driver |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● Low RDS(ON) outputs● Automatic current decay mode detection/selection
● Mixed and Slow current decay modes
● Synchronous rectification for low power dissipation
● Internal UVLO and thermal shutdown circuitry
● Crossover-current protection PACKAGE: 24-pin TSSOP with exposed thermal pad (suffix LP) Not to scale
DESCRIPTION
The translator is the key to the easy implementation of the A3984. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A3984 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. The chopping control in the A3984 automatically selects the current decay mode (Slow or Mixed). When a signal occurs at the STEP input pin, the A3984 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.
