DRV8843

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SLVSAS8D – APRIL 2011 – REVISED NOVEMBER 2015

7.4.6 Protection Circuits

The DRV8843 is fully protected against undervoltage, overcurrent and overtemperature events.

7.4.6.1 Overcurrent Protection (OCP)

An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this

analog current limit persists for longer than the OCP time, all FETs in the H-bridge will be disabled and the

nFAULT pin will be driven low. The device will remain disabled until either nRESET pin is applied, or VM is

removed and re-applied.

Overcurrent conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor

winding will all result in an overcurrent shutdown. Note that overcurrent protection does not use the current sense

7.4.6.2 Thermal Shutdown (TSD)

If the die temperature exceeds safe limits, all FETs in the H-bridge will be disabled and the nFAULT pin will be

driven low. Once the die temperature has fallen to a safe level operation will automatically resume.

7.4.6.3 Undervoltage Lockout (UVLO)

If at any time the voltage on the VM pins falls below the undervoltage lockout threshold voltage, all circuitry in the

threshold.

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