Other Parts Discussed in Thread: UCC28180, UCC28070EVM, UC3854, UCC2818, UCC28070, UCC28065
one of TI's tech support that their UCC28180 had been successfully used at the AC line frequency of 400Hz. We obtained their evaluation board, the UCC28180EVM, and gave it a good try. My results were not good. At 400HZ, high line, the power factor fell below 0.9. In addition, at frequencies above 400Hz, (where MIL STD 704F goes to 800Hz for "Variable AC") the parts looks hopeless.
Second: We tried a UCC28070EVM evaluation board which gave us mixed results. Power Factor was good all the way to 800Hz at 115V in. However, the harmonic distortion was out of spec the for the entire frequency range, all at 115V. This part has promise but I'll want some help experts in overcoming the THD problem. By the way I have some data for the proper TI expert. Another good aspect of this part is that the current is not leading the voltage. There seems to be zero degrees between voltage and current in contrast with the UCC28180 where the Power Factor is always leading.
Third: I have also been looking at several other TI parts such as: UC3854, UC3855, UCC2818, and UCC29065. I want to discuss the possibilities of which of these part(s), or any others, would possibly be usable here.