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TPS7A4501-SP: What parameters to use for a worst case analysis?

Lauren Mayfield
Expert 7875 points
Part Number: TPS7A4501-SP

Tool/software:

I am trying to run a worst case analysis on the circuit using this part and wanted to know what tolerances I should include in my calculations to accurately capture the full range of the regulated voltage. Right now I am just using the variation of the Vadj 1.174V-1.246V. This is the variation from the datasheet which is specified as over the full temperature range, but it’s unclear if this includes radiation or aging. Should I be considering anything from the internal error amplifier like input offset voltage, input bias current, and input offset current or are these small enough to be considered negligible?

  • +1
    TI__Genius 11950 points

    Hi Lauren,

    It will ultimately be your call on what factors you want to include in your analysis, and how detailed you'd like it to be depending on the mission profile and risk tolerance. 

    The electrical spec limits in the SMD (often the same as the datasheet) are valid for Group C aging and Group E radiation. These spec limits often also include variation across voltage, load, and some statistical guard banding as well (unless otherwise specified in the test conditions), so using them is generally a more conservative approach to WCA since the part often only operates in a subset of these full ranges. 

    As an example, some additional factors that could be included in analysis are: line/load regulation, external resistor tolerances, and ADJ pin leakage.

    Thanks,

    Sarah