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LM3478 SEPIC - problem

Hi everyone,

I'm designing a regulator with these characteristics:

- Input voltage: 6 - 30V

- Output voltage: 18V

- Output max. current: 0.5A

The regulator is working perfectly with the MOSFETS 2N7002P and SI7414, but with SI2308 and DMG6968 they burn instantly when I turn the device on.
The test was done with ~18V input voltage.


Anyone could help me to explain why the si2308 and dmg6968 simply burn instantly? They have some characteristcs that I missed?

Thank you very much.