UCC5304 drive and power

[rskh]

Hello,In the diagram sown below I have a MOSFET called NDT3055L, the mosfet sends the current into the Qorvo TGA2590-CP drain.
When we test the circuit the source of the mosfet is basically floating although when I will connect the amplifier to source then the QORVO amplifier will introduce a load to the source of the mosfet.
Somehow the optocoupler helps with the transition of the state when we don't have QORVO amplifier load on the source of the MOSFET.
What is the role of the optocoupler in this situation?
I'll be glad to have some analog design logic behind putting this component in this position.
Thanks

 

[rskh]

Hello friends,
I have a load consisting of a resistor and an LED that operates at 200 volts. Due to the high voltage and current of the load, I must ensure isolation between the power circuit and the control circuit. I have not used the UCC5304 before.
The control circuit is powered by an isolated DC/DC converter, and the power supply for the UCC5304 driver circuit is provided using an LM1085 linear regulator.
Is the chosen power supply, isolation, and UCC5304 setup appropriate?
Do you think the circuit I designed is correct or has any issues?
I’d appreciate your guidance.