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DRV8837C: DRV8837C over current failure discussion

Sammi Shang
Expert 4450 points
Part Number: DRV8837C

Dear team,

Customer want to know if keep adding current like 1.2~1.4A to DRV8837C over 10s, the IC will execute over current protection, but will the IC be broken with over 10s over current affect?

Thanks.

Best regards,

Sammi

  • 0
    TI__Guru** 114905 points

    Hi Sammi,

    The device may or may not execute over current protection between 1.2 and 1.4A. Please note 1.2A is a minimum value, but the maximum can be higher.

    If the current is greater than 1.2A and does not execute over current protection, over temperature protection should be executed. Over temperature protection is intended to protect the device when the junction temperature increases due to high current through the FETs.

  • 0 in reply to Rick Duncan
    TI__Expert 4450 points

    Hi Rick,

    Thanks for your reply. I think my question is not very clear.

    Customer now will face a situation that if current above 1.2A, theoretically that IC may execute over-current protection. And will execute tDEG, then retry in tRETRY time. Customer worried if the over-current continuously added on IC for example lasted for more than 10s, the IC will keep execute tDEG and tRETRY, will this broken the IC?

    Or I see you mentioned over-temp protection, so will this cause IC go into thermal protection?

    Thanks.

    Best regards,

    Sammi

  • 0 in reply to Sammi Shang
    TI__Guru** 114905 points

    Hi Sammi,

    The OCP retry time is set to allow the temperature to reduce after an overcurrent event. There should be no issue with the device operating into a short as described.

    At 1ms retry time vs 1us deglitch time, the outputs are on 0.1% of the time during the 10s. That equates to ~10ms on and 9.99s off for cooling the device.