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DRV8350: Implementation of the deglitch time on the VDS_OCP overcurrent trip

Rohit nandan
Prodigy 20 points
Part Number: DRV8350

Tool/software:

Hello, I would like more information on how the deglitch time is feature is implemented for the VDS_OCP overcurrent fault. According to the datasheet(Page 38), I only see a difference amplifier and a comparator, which triggers on VDS_OCP.

I do not see any hardware circuit corresponding to the deglitch time implementation.

I would like to know

  • Is a VDS_OCP fault triggered when the average value of VDS is beyond the trip level for more than the deglitch time?
  • Is a VDS_OCP fault getting triggered when the absolute value of VDS is beyond the trip level for more than the deglitch time?
  • What would happen if there is ringing on VDS? Would an OCP be triggered?
  • 0
    TI__Genius 12231 points

    Hi Rohit, 

    Thank you for posting to our forum! 

    Rohit nandan said:
    • Is a VDS_OCP fault triggered when the average value of VDS is beyond the trip level for more than the deglitch time?
    • Is a VDS_OCP fault getting triggered when the absolute value of VDS is beyond the trip level for more than the deglitch time?

    a VDS_OCP fault triggers when the measured VDS voltage differential is compared with the OCP threshold and is found to violate the threshold for longer than the deglitch time. This measurement uses the actual measured live voltage. 

    Rohit nandan said:
    What would happen if there is ringing on VDS? Would an OCP be triggered?

    In the case of transients, the OCP fault would trigger only if the transient last longer than the deglitch time.

    I hope this helps to answer your questions. 

    Best Regards,

    -Joshua