Other Parts Discussed in Thread: UCC28070, UCC28951, UCC28070A
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Hello,
The UCC28951 is parametrically the same as the UCC28950 and also is pin to pin compatible. So if the UCC28951 device is in stock you should be able to use that for your design.
There is also a UCC28070A interleaved PFC controller that you should be able to use in your design as well.
Regards,