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DRV8245-Q1: out short ola

Jin-Suk Choi
Intellectual 2270 points
Part Number: DRV8245-Q1

Hi~ Customer is under test open-short, and reported strange case.

When short one OUTx to GND during normal operation, OLA fault was triggered.

It's not clear understand why OLA was trigger when short OUTx to GND?

Below is register setting.

COMMAND        0x89

CONFIG1        0x90

CONFIG2        0x20

CONFIG3        0x47

CONFIG4        0x04

Thanks.

  • 0
    TI__Mastermind 18820 points

    Hi Jin-Suk,

    I had a few questions in order to better understand the issue:

    Is there a load present?

    If there is a load, what is the configuration (High-side, Low-side, Full-bridge)?

    Is the load current higher than the IPD_OLA current?

    Is there still an OLA fault when output is not grounded (normal operation)?

    Best,

    David

  • 0 in reply to David Medis
    TI__Intellectual 2270 points

    Hi~ David.

    Please, refer my feedback.

    Is there a load present? -> Yes, under working status, shorted one OUTx to ground.

    If there is a load, what is the configuration (High-side, Low-side, Full-bridge)? -> Full bridge, 

    Is the load current higher than the IPD_OLA current? -> yes, load current is 300mA and higher than ipd_ola.

    Is there still an OLA fault when output is not grounded (normal operation)? -> no, when shorted OUTx to ground, expected OCP fault but OLA happened, that's why I'm asking. normal operation has no OLA.

  • 0 in reply to Jin-Suk Choi
    TI__Mastermind 18820 points

    Hi Jin-Suk,

    Please give me 24 hours to look into this further. 

    I will get back to you when I know more.

    Best,

    David

  • 0
    TI__Mastermind 18820 points

    Hi Jin-Suk,

    OLA, or OCP can be triggered for various reasons. Having OLA trigger under the described parameters is not unexpected. By having the OLA trigger first during the active state only protects the device from a possible misconfiguration and does not necessarily mean “open-load”. In full-bridge mode if the device was shorted at OUT2, the current spikes from the PWM switching could trigger an OLA fault. The inductance of the wire used to short the output could have also played a role in triggering one fault over the other.

    The OLA can be thought of as the first “flag” that was thrown and does not necessarily mean “open-load”. The best way to determine which fault occurs is to run an offline diagnostics test.  

    Best,

    David