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LM25122-Q1: selecting Boost Diode

Part Number: LM25122-Q1
Other Parts Discussed in Thread: LM5122EVM-1PH

Dear all,

Could you teach me how to select boost diode voltage rating?

I know you mentioned at data sheet to choose this should be greater than SW plus 16V.

But what is this 16V meaning?

I would like to know why you choose 60V diode at LM5122EVM-1PH.

And I want to use 40V diode at Vout=SW=12.5V system. Is there something concerned?

Best regards,