Dear Motor Drive Team.
I have a question related to overcurrent protection feature in DRV8871: can it be assimilated to the one implemented on DRV8842 (on each fet) or is it monitored on the entire HB?
here below from DRV8842 DS
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. Overcurrent protection does not use the current sense circuitry
used for PWM current control, and is independent of the ISENSE resistor value or VREF voltage.
Furthermore is there any difference between the two DRV in terms of overcurrent protection in case of phase short condition?
Thanks for your inputs
Kind Regards
Nicola
