A4973

A4973 Full-Bridge PWM Motor Driver 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 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. With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected source driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false trig...