Electronics > Beginners
Blown mosfet : I don't know why
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ratatax:
This is super interesting. I measured my 12V in when switching on and it has a peak to about 20V. It shoudn't be what destroyed the mosfet, but I'll try to damped it a bit just to be safer on the long run !
My custom DC/DC converter has a 10 uF + 100nF mlcc input cap.
Siwastaja:
Add a plain old cheap electrolytic capacitor with C many times the C of  the MLCCs. For your case, say anything over 47uF does the trick.

Having high-ESR capacitance on the DC bus dampens oscillations, but also limits the voltage rise in case you have an inductive load discharging back to the bus.
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