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TPS43060: Difference between value in simulation and datasheet

Eric LOUVEL
Prodigy 50 points
Part Number: TPS43060

Hi,

With WEBENCH power designer tools, I design TPS43060 with these parameters Input: DC 12 V - 28 V, Output: 32 V at 3 A.

The tools gives this results: Rsns1=Rsns2=7mR (Rsense=3.5mR) and L1=4.7µH (-> Ilpeak=9.98A).

Page 24, formula (20) of the TPS43060 datasheet (SLVSBP4D – DECEMBER 2012 – REVISED SEPTEMBER 2014), the relation between Rsense and IL1pk is : Rsense = 68mV / (1.2 x Ilpeak).

With this formula and Ilpeak=9.98A (gives by WEBENCH), the Rsense is 5.7mR.

My question is : Where does this difference come from ? the calcul gives Rsense=5.7mR and simulation gives 3.5mR

Thanks for your help.

Best regards

Eric

  • 0
    TI__Genius 16515 points

    Hello Eric,

    Thanks for reaching out to us via e2e.

    Webbench Power Designer is a good tool to start with, especially when you do not even know which device to use.
    But it is not really a professional simulation tool.

    To calculate the components of your power stage, compensation etc, I would always recommend using the Quick-Start Calculator tools, whenever available.
    For the TPS43060 you can download it from here:
    www.ti.com/.../SLVC471

    All information in this correspondence and in any related correspondence is provided “AS IS” and “with all faults” and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml).

    Best regards
    Harry