Jadeit
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Hi,
The better the layout, the less is stray inductance --> the less overshot. Thus you need less headroom.
Klaus
Partially. It depends more on the conversion factor. It's better to make the selection at worst-case operating point and to use "identical" switches too.I think the voltage rating of Q1 is more critical as Q2.
Klaus
Thanks for information. I have nominal voltage 48V, 55V as maximum with +15% and plan use 80V MOSFET.