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TPS54360: About calculation for VBOOT and Rds(on)

Part Number: TPS54360

Hello E2E,

I tried to calculation VBOOT, result was negative value.

Vin=32V, Vf=0.52V, fsw=130kHz, IB2SW=100uA.
->VBOOT= - 0.5196V.

Maybe, I do not understand the formula exactly.
Do you know the same case or question?

About Fig.1, VB2SW are 3V and 6V.
Please let me know about condition for operating.


Regards,
ACGUY

  • Hi,

    I have try to calculate equation 2 according to your input condition and i get a VBOOT value of 4.43V. 

    Do you convert the 130kHz to MHz? Also for figure 1, this data could come from a tester with open loop condition with test mode to measure Rdson. 

  • In reply to Arief Hernadi:

    The conversion from kHz to MHz is still correct. However, there was one small miscalculation with tsw. Here is the revised version.

     

    Sincerely,

    Eric

  • In reply to Eric Sato31:

    Keep in mind that the IC will clamp VBOOT to 6V. So any result over 6V should be used as 6V.

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