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TPS7H5001-SP: Current Limit Threshold Typical Value

Chad Whiteley
Prodigy 50 points
Part Number: TPS7H5001-SP

Tool/software:

Hello,

I notice in the datasheet for this part that the Electrical Characteristics table (7.5) lists the Current Limit Threshold as 1.05V (typical) & 1.09V (max).

But then in the Typical Characteristics plots (7.10, figures 7-17 & 7-18) the lowest threshold range over temperature and voltage is 1.0525 - 1.068V (with the 25C data being at the high end of that range). The prior listed typical value falls outside this range, which seems odd.

In using this part, with Vin=5V, I have measured the threshold to be about 1.065V, which appears to fall in line with the plots (approximately).

Is the 1.05V listing supposed to be the minimum value (instead of typical)?

Thanks
Chad

  • +1
    TI__Mastermind 26895 points

    Hey Chad,

    Typical graphs are done using 1 device we actually test.
    Electrical characteristics are done with multiple devices.

    Sometimes there are differences between the typicals we pick based on multiple devices, and the one device we test for the typical graphs.

    Thanks,
    Daniel

  • 0 in reply to Daniel Hartung
    Prodigy 50 points

    Aha, thanks, that makes sense.

    I am interested in this in the context of performing a worst case analysis on my converter based on this PWM. The datasheet does not list a minimum value for this parameter. Do you think it would be safe to use a similar tolerance for estimating a minimum? In this case, the 1.09V max is approximately 3.8% above the 1.05V typical. Would a minimum of 1.01V (3.8% below 1.05V) be reasonable? (Alternatively, are you/TI able to proved a minimum value?)

    Thanks again,
    Chad

  • 0 in reply to Chad Whiteley
    TI__Mastermind 26895 points

    Hey Chad,

    We cannot guarantee a value we don't test to, but its not wholly unreasonable to use a value like 1.01 V as a minimum for analysis purposes.

    Thanks,
    Daniel

  • 0 in reply to Daniel Hartung
    Prodigy 50 points

    Fair enough,

    Does TI have any test data you can share that might help characterize this min (with no guarantees)?

    -Chad

  • 0 in reply to Chad Whiteley
    TI__Mastermind 26895 points

    Hey Chad,

    Lets take this offline, I will email you at the email you used to sign up for your account.

    Thanks,
    Daniel