UCC28C43: instability of the output voltage

Part Number:UCC28C43

Hello,

I designed a DC/DC Boost converter with the following specif.:

- Vin 30/40 V

- Vout 325 V

- Iout 600 mA

I used the ucc28c43. The simulation as you can see on the picture does not achieve the desired output voltage even if I use a larger TSTOP. I also tried to use steady state conditions but the situatios remains the same.

Maybe I got a wrong design of the compensation network. Can you help me to undestand how to solve it?

Thank you in advance,

Gerardo Saggese