Hi everyone,

I have a question regarding flyback converter control.
I am currently trying to create a LED ballast using flyback converter topology, however, I am unable to produce the voltage 10V and current 1A that I would like to get. I suspect that the problem is with the control system that I have designed but i cannot figure out what went wrong.
The given parameters are Vin = 240Vac 50Hz, Po = 20W, fsw = 200kHz.

I have attached a photo of the circuit diagram created using PSIM and I would appreciate it if you guys can help me with this.
Thank you.

 

I'm not a favourite with simulation software,and can't see it working , but in the real world the voltage feedback for the Tl431 is set to 16V with the values 12K and 2K2, ideally post the full pwm chip oscillator circuit.