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Original question:

UCC28951: Maximum frequency at SYNC in follower mode

UCC28951: sync frequency tolerance

Mason Downes
Prodigy 130 points
Part Number: UCC28951
Other Parts Discussed in Thread: UCC28950-Q1, UCC28950

Tool/software:

Hello,

Our US A&D customer has a question on the UCC28950-Q1 SYNC pin operation. Would you please help with the inquiries below? 

I had a couple questions for controller UCC28950, to be used in follower mode, where SYNC (pin 16) is an input. I understand that the sync frequency max tolerance is 10%. Our application has a sync frequency range of +/-15%:

  1. What are the consequences if the sync frequency exceeds the +10% limit by max tolerance?
  2. What are the consequences if the sync frequency is below the -10% limit by our min tolerance, if different from the first case?