How to Simulate TopSwitch Flyback Converter with Optocoupler Feedback in SPICE?

Hello guys, 
I`m struggling with the simulation of one of TopSwitch`s devices.  I calculated the schematics, however I need to simulate it in order to be able to prove that the calculations are correct. The device is a flyback switch with optocoupler feedback, the reason I am not able to simulate the schematics is that I can`t find the control unit (the switch iteself) anywhere as a part. If anyone has any suggestions, I would be very grateful!
Cheers, Alex

Perhaps you need of spice model...Where are you simulating it?

I tried to simulate it in LTspice and the problem is that I cant find it as a part in any library.

yes, ok. You should insert the model. Please check with other similar model already inside, and change the parameter using its data sheet.

Alex,Have you tried checking with the manufacturer of your switch for a spice model? If they have one, you should be able to add it to your model in LTspice.