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TPS7A4501-SP: Clarification of section 8.3.3 Overload Recovery of the TPSA4501 data sheet

Chuck Sampson
Intellectual 350 points
Part Number: TPS7A4501-SP

Hello,

We are considering using the TPS7A4501-SP in a high rel application. In section 8.3.3 Overload Recovery of the TPS7A4501-SP data sheet a condition is described where the regulator cannot recover from a short circuit without resetting the input voltage. We cannot reset the input voltage after a short circuit in our design.

Can you recommend a work around or another regulator that can fully recover from a short circuit?

Thanks,

Chuck Sampson

  • +1
    TI__Guru 62930 points

    Chuck,

    This can occur with certain load profiles of active loads with larger input to output differentials.   Much of this is caused by the necessity for current limit to change due to large Vi to Vo delta.  When short occurs, nearly the entire Vin range is across the pass transistor.

    This application note discusses this some.

    https://www.ti.com/lit/an/snva736/snva736.pdf

    With respect to other space rated LDOs.  We have the TPS7H1101A-SP, that has current limit control, and soft start along with some other enhanced features.   It does have a more limited Vin range of up to 7V. 

    I will solicit feedback from others on potential work-arounds.  However, I don't see any viable options short of disconnecting load or Vin.

    What Vin/Vout and load requirements do you have?

    Regards,

    Wade

  • +1 in reply to Wade Vonbergen
    TI__Guru 62930 points

    I was not able to get any additional feedback on practical alternative ways to overcome this potential issue. 

    I am going to close this thread as resolved, so it will close it out. 

    You can reply back, and it will re-open.

    Please click "This Resolved My Issue" to close out the post.
    Regards,
    Wade

  • 0 in reply to Wade Vonbergen
    Intellectual 350 points

    Hello Wade, thanks for answering my question thoroughly. It helped a lot.