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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.