The difference between UCC28063 and UCC28061.

Please see attached power point slide.

Hello， Did you upload any attachment?

It was attached yesterday but for some reason it did not post.  I will try again.

Mike

Looks like it made it this time.

Thank you so much for your help.Are you a TI employee?

Have you used UCC28061 or UCC28063? I have already debug PFC(Expected 2kW) board with UCC28061 for several weeks.but both driver signals of the UCC28061 operate either in same phase or CCM MODE. DO you have same suggestions about  noise alleviation.looking forward to you reply.

tracy

If your phases run at the same time, your ZCD-winding in one of them could be connected the opposite way.

Additional thoughts,

I thought that do to the peak currents and inductor size that these designs were limited to 400 W per phase.  Theoretically you could get it to work. Typically for 2 kW designs people use average current mode control.

With this device the phases are put a 180 degrees out of phase with each other with a phase lock loop.  They start in phase an will gradually get locked 180 degrees out of phase.  A peak current activation will also put the two phases in phase.

Regards,