Allegro MicroSystems Europe’s SLA7042M and SLA7044M ranges of motor controller/driver modules are designed for high-efficiency microstepping operation of 2-phase unipolar stepper motors.
The devices use an innovative power multi-chip module packaging technology which allows high-power NMOS FETs to be combined with monolithic CMOS logic/control circuitry, providing a cost-effective ‘turnkey’ solution for motor operation up to 3A and 46V.
The combination of ratings and performance levels made possible by this technology offers significant benefits in stepper drive applications when compared to the higher dissipation and slower switching speeds associated with bipolar transistors.
The ability to carry out microstepping control also provides improved resolution without limiting step rates, and provides much smoother low-speed motor operation.
PWM current is regulated by appropriately choosing current-sensing resistors, a voltage reference, and digitally programmable current ratio. Users can also select full-step, half-step or microstepping motor control. Inputs are compatible with 5V logic and microprocessors.