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TAS5711: ROCP & Overcurrent limit protection

Martin Seeger
Expert 5411 points
Part Number: TAS5711

Hi Team,

our customer wants to use the TAS5711 and wants to modify the overcurrent limit.D/S explains the mechanism on page 24 + some electrical specs on page 9. 

-> However no details how to calculate ROCP.

Do you have some more details?

Best Regards
Martin

P.S.: concrete example: what does ROCP need to be for 250mA

  • 0
    TI__Mastermind 20411 points

    hi martin

    i am afraid for the adjustable range is very small. 

    even reduce the OC_ADJ resistance, it cannot increase OC threshold that much. 

    considering the resistance variance, the OCP been adjusted would be not very accurate.

    so we recommend using actual measure to confirm how much OC can increase when Roc be small.

    thanks.

    jesse

  • 0 in reply to Jesse Ji
    TI__Expert 5411 points

    Hi Jesse,

    thanks.

    D/S might be then a bit misleading - OC seems to be rather "adjustable" vs. fully "programmable"?

    Would be good to understand how big the range was of this adjustment. Is it in the range of only some tens of mA, or maybe higher than some hundreds of mA? Then again an equation would be helpful.

    Best Regards
    Martin

  • 0 in reply to Martin Seeger
    TI__Mastermind 49770 points

    Hi Marin

       I'm sorry there's not very clearly information left for this function, we can't provide an equation. To change this resistor, would slightly change the the reference voltage of the inside comparator, then the OC level will slightly change. We'll see if we could find out what would be the theoratically OC point when using smallest resistor value 20Kohm, but it's not garanteed, only for reference.

  • 0 in reply to Shadow He
    TI__Expert 5411 points

    Hi Shadow,

    thanks - did you find out the theoretical OC point for 20k?

    Best Regards
    Martin

  • 0 in reply to Martin Seeger
    TI__Mastermind 49770 points

    Hi Martin

       Sorry, still not. This device is too old, even the inner schematic can't be opened by our team. I'll see if there's any other way.

  • +1 in reply to Shadow He
    TI__Mastermind 49770 points

    Hi Martin

        The OC point is likely to have 6% change when using 20k resistor. The value is from our other device's experience, the function could be similar with each other. I'm sorry for can't provide more precise data about it, it's all we have right now.