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How to calculate minimum off-time at Vin(min) for LM25011

Other Parts Discussed in Thread: LM25011

Hello.

I have calculated minimum off-time at Vin(min)  for LM25011 according to datasheet 8.2.1.2.1  (Equation 10)  and in  Spreadsheet-based quick-start calculation tools. And I have got very different result.

I use next parameters

Vout 6,9
Vin min 9,2
Vin nominal 12
Vin max 14,4
Imax 0,80
Nominal Frequency 1000 kHz

Could you tell me why? And which of result is true?

Thank you.