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I am designing a SMPS from TI http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf

We replaced the Mosfet fro schematic with STL11N65M5 that has a Coss of 18pf

So I am designing a RC snubber across it and I calculated at about 47pf (and use R of 50R). The overshoot and damping is not optimized.

So I am trying to increase the C to 330pf (with a 50R) but my Mosfet blows up. How to calculate the maximum capacitance of RC snubber that Mosfet can whitstand ? Is it in relation to C and R ?

(we already removed the ferrite beads question)

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I found out that 0.1uF to 1000pf are good choices

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