UCC28051: 400W PFC capability

Hello Kai,

The power is handled by the power devices outside of the controller so the controller itself doesn't have a maximum power level it can support.  Generally speaking however, with single phase TM PFC controllers (sometimes referred to as CRM) such as the UCC28051, the switching currents and magnetics start to get "unreasonably" large > ~300W.  There are other factors that influence this such as the input voltage range the design has to operate over.

Here is an example of a 350W reference design using the UCC28051 TM PFC controller: https://www.ti.com/tool/PMP22087 . I don't have any examples of a higher power design.

It can be subjective as to what is "reasonable" or "unreasonable" since different applications have their key care-abouts.  However, somewhere around 200W - 300W, customers typically prefer either an interleaved solution such as the UCC28063/4A/5 family, so that the power is divided between the two phases (and therefore the power devices and magnetics can be sized accordingly), or a single-phase CCM controller such as the UCC28180 or UCC28019A.

I hope this helps.

Regards,

Ray