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TPS745-Q1: TPS745-Q1 loop test issue

Xiaoxiang Liu
Expert 7585 points
Part Number: TPS745-Q1

Hi team,

Can customer test TPS74501PQWDRVRQ1 loop stability with Bode100?

Could you provide the corresponding method of loop test?

Thanks

Xiaoxiang

  • 0
    TI__Mastermind 37075 points

    Hi Xiaoxiang,

    Can you please identify your customer? We need the customers name so we can confirm if they are on the entity list.  If they are, it is no issue, we just need to move this thread to the public E2E forum.

    To answer your question:  Unfortunately there are internal loops which cannot be broken and thus, the bode plot method cannot be used to test the loop stability of the LDO by breaking the feedback loop of the external feedback resistors.  We recommend conducting a load transient test per the following app note to assess stability:

    https://www.ti.com/lit/an/slva381b/slva381b.pdf

    If the customer has access to a frequency response analyzer that can conduct the Noninvasive Stability Measurement (NISM), then NISM is another option.  Both methods are acceptable methods of testing the loop stability.

    https://www.picotest.com/products_NISM_software.html

    Thanks,

    Stephen