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UCC28950 DCM to CCM Transition

Other Parts Discussed in Thread: UCC28950

Hello,

I have been studying the UCC28950 device for use up to 48v / 50A Power Level.

Studying the 12v eval module the transition between DCM and CCM is very smooth - however when I adjust for 48v operation a large phase shift / jump is observed at my desired DCM to CCM point. 

I looks like maximum duty is immediately applied (not at full load though!)

Can anybody confirm why this occurs?