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DRV8872: Issue with a motor integrates capacitor and varistor

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Part Number:DRV8872

DRV8872Q1 met issue in one automotive account.

Attached motor structure and parameter. 

All the test were run on EVM.

If set INx prior to VM, the motor can start-up and spin.

If set VM prior to INx, the nFault indicator LED lights on, waveform shows OCP seems to be triggered and auto-restart every 3ms.

Replaced current sensing resistor to 150mohm, 330mohm, 400mohm, 500mohm, 750mohm, 1ohm. The issue remains.

Considering the charging to capacitor leads to the OCP during start-up at high VM, current limitation should help to limit the start-up current and get the motor spin.

Wonder why the current regulation circuit seems does not effective in this case.


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