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UCC28951: what's the difference of UCC28950 and UCC28951?

Part Number: UCC28951
Other Parts Discussed in Thread: UCC28950

Hi

what's the difference of UCC28950 and UCC28951?

customer used UCC28950 in their system, now they want to use UCC28951 in their new project.

customer want to know:

1.what's the difference of UCC28950 and UCC28951?

2. are they P2P?

3.do they need to change PCB layout?

4. do they need to change external component value?

thanks.