Datasheet for the Allegro A3987 DMOS Microstepping Driver with Translator, featuring built-in translator for bipolar stepper motors.
The Allegro A3987 is a complete microstepping motor driver with a built-in translator designed for easy operation with bipolar stepper motors. It supports full, half, quarter, and sixteenth step modes with an output drive capability of 50 V and ±1.5 A. The device includes a fixed off-time current regulator capable of slow or mixed decay modes, automatically selecting the decay mode based on the step direction to reduce audible noise and power dissipation.
| Load Supply Voltage | 8 – 50 V (Operating) |
|---|---|
| Output Current | ±1.5 A |
| Logic Supply Voltage | 3.0 – 5.5 V |
| Nominal Operating Temperature | –20 to 85 °C |
| Maximum Junction Temperature | 150 °C |
| Package Type | 24-pin TSSOP with exposed thermal pad |
| Microstep Resolution | Full, Half, Quarter, Sixteenth step |
The A3987 has an output drive capability of 50 V and ±1.5 A.
No, special power-up sequencing is not required for the A3987.
The maximum junction temperature is 150 °C.
The translator sets the decay mode to slow if the current increases, and to 30.1% fast decay if the current decreases.