UCC28750: UCC287502

Tool/software:

I am using UCC28750 to design a power supply with input from the grid and output voltage of 24VDC 6A. When running the circuit, my circuit makes a noise when running at over 50% load. With a load below 50%, I run completely normally. I have tried changing different controllers and performing simulations, all of which give good results, however, when running the experiment, the circuit still makes a noise. I have not yet determined where the error comes from. Please support me on this part.