A4973SB-T Datasheet PDF - Allegro MicroSystems

●Description

●Designed for bidirectional pulse width modulated (PWM) current control of inductive loads, the A4973 is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a user- selected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required.

●Features and Benefits

●▪ ±1.5 A continuous output current

●▪ 50 V output voltage rating

●▪ 3 V to 5.5 V logic supply voltage

●▪ Internal PWM current control

●▪ Fast and slow current-decay modes

●▪ Sleep (low current consumption) mode

●▪ Internal transient-suppression diodes

●▪ Internal thermal shutdown circuitry

●▪ Crossover current and UVLO protection