Texas Instruments’ DRV8871 brushed-DC motor is an excellent solution when designing printers, appliances, industrial equipment, and other small machinery. Its two logic inputs control an H-bridge driver consisting of four N-Channel MOSFETs that in turn, control motors bi-directionally with up to 3.6-A peak current. The inputs governing motor speed can also be controlled using pulse-width modulation (PWM), through multiple current-decay modes.
The device also features a unique solution: its advanced current regulation circuitry is devoid of any analog voltage reference or external sense resistor, allowing the use of stand low-cost, low-power resistor to set the current threshold. By limiting current to a known level, the DVRV887 can maintain stable voltage while severely the reducing power requirements and bulk capacitance, especially during motor startup and stall conditions.
What’s more, DVRV887 is completely protected against short circuit and faults, under-voltage (UVLO), over-current (OCP), and over-temperature thermal shutdown (TSD). There’s even an automatic fault recovery system that helps restore normal operation once the fault condition is removed.
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