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TPS56221: Why does the reference design exceed the temperature

Part Number: TPS56221

Hello,

I am trying to figure out how to use TPS56221 in a 12V to 0.9V, we think 15A maximum on the whole industrial temperature range (-40°C/+85°C) environment (and a quick 1 to 5ms max on time).

I was looking into the example that is inside the datasheet but I also am intrigued by our answer on this 12V to 3.3V, 25A, at 70°C answer. 

How can I be sure that my design is safe on the all temperature range ?

And if I may add a question on the example. How is the self chosen ? Because the equation gives an approximated 186nH but the 320nH is chosen wheras the same self family has 180nH and 215nH ? And the 5.8A peak to peak ripple current that is used for this self doesn't make any sense to me.

Thanks for your help.