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TPS54202 Estimation for the crossover frequency, inductor and output capacitor selection

Other Parts Discussed in Thread: TPS54202

Hi everyone,

I am working with TPS54202 and I have questions with the estimation for the cross over frequency, inductor and output capacitor.

The crossover frequency:

How does 40kHz come from? I can't find it in datasheet. For this equation, how can I get 3.95? 

As for output inductor and capacitor, how can I get these equations? Any reference documents recommend? Thank you!