DMOS Microstepping Driver with Translator

The A3983 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 eighth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A3983 includes a fixed offtime current regulator which has the ability to operate in Slow or Mixed decay modes.

The translator is the key to the easy implementation of the A3983. 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 A3983 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.

FEATURES

■ 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