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DRV8873-Q1: Deglitch time for ITRIP current regulation

Tyler Holmvik
Intellectual 821 points
Part Number: DRV8873-Q1

Tool/software:

Hi -

What is deglitch time on the ITRIP user-set current regulation? 

I see tOCP is rated to 3uS typical / 5uS max. Also I see IPROPI typical with max SR is 10.5uS. Is ITRIP related to either of these values?

Thanks,

Tyler

  • 0
    TI__Genius 9190 points

    Hi Tyler,

    Thanks for your question. 

    I am checking on this internally and will get back to you.

    Thanks,

    Ibinu

  • 0 in reply to Ibinu Alaudeen Nadeera
    TI__Mastermind 38975 points

    Hi ,

    Thank you for your question.

    ITRIP does not have deglitch time. ITRIP has tBLANK time only and it is "masking period" right after "DRIVE" starts.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    TI__Intellectual 821 points

    Hi Shinya, 

    Thanks for information. To clarify, when current goes beyond ITRIP user-set limit, the device will tBLANK time to recover (brake / decay) back below the user-set limit? So in this case it would be 5uS typical. Is that correct? Or am I misunderstanding?

    Tyler

  • 0 in reply to Tyler Holmvik
    TI__Mastermind 38975 points

    Hi  Tyler,

    brak/decay time is set by TOFF, not tBLANK. 

    tBLANK is ITRIP detection mask time. If we have such current peak during tBLANK, ITRIP will not be detected.

    regards

    Shinya

  • 0 in reply to Shinya Morita
    TI__Intellectual 821 points

    Hi Shinya, 

    Thank you for the explanation. The time period I am talking about is highlighted in yellow:

    Can you help me understand how long the drive current can exceed ITRIP limit before the device moves into brake/decay mode? My customer had the following question, which is why I am asking: how long the current needs to stay above the trip limit to trigger the overcurrent regulation?

    It still is not clear to me. My understanding is the time period I am looking for it neither tBLANK nor tOFF. Can you point me to which table in the datasheet defines this.

    Regards,

    Tyler

  • +1 in reply to Tyler Holmvik
    TI__Mastermind 38975 points

    Hi Tyler,

    Thank you for your questions. Once current level exceeds ITRIP level, output moves to Brake/decay immediately without intentional filter. It may have ??ns delay, but we can consider it is "immediately" 

    tOFF is period to restart "DRIVE". Here is my explanation. DRIVE"as A" starts and keep A/DRIVE until current level hit to ITRIP. As soon as hitting ITRIP, move to "B as Brake/decay". After tOFF period, it backs to A again.

    Overcurrent protection is different topic. Not part of ITRIP.

    regards

    Shinya