Problems with LTC4366

Hello. I need help with LTC4366 circuit. I need to develop a supply that is protected from voltages upper then 30 V DC (up to 400 V AC) and that must work from 10 V DC, so I've chosen LTC4366 for this application. Now I'm trying to make it work, but than I turning on the supply (from 18 V DC) I see that my mosfet is working in analog mode and I see only 4.5 Vgs. I've already tried to change capacitor between OUT and VSS pins to 0.22 uF, but it couldn't help... I have 12 V between GATE and VSS. Can anyone help me and said what am I doing wrong...  

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