**Part Number:**UCC28780

**Other Parts Discussed in Thread:**UCC27712

Hello, TI experts!

I am designing an ACF converter based on UCC28780 and UCC27712.It was supposed to make a converter for an output voltage of 24 V, a maximum power of 80 watts.

I ran into an error triggering problem, presumably OPP.

RM8 (TDK) is used as the transformer core, namely B65811J0250A087, winding 20: 5: 5. The problem is that I observe the saturation of this core at a switching frequency of 2 kHz, which is why I suppose the OPP is triggered.

How can this problem be solved? Or is this considered normal operation?

Also the UCC27712 fails often, I get LO of no more than 2.25 volts.

Thanks in advance for your answer!

If necessary, I am ready to provide a schematic and a design calculator.