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Vcs of UCC28050

Other Parts Discussed in Thread: UCC28050

Please teach us a way of thinking of  UCC28050's Vcs .

Page 7 of the data sheet of this device has a calculating formula  for the threshold of the VCS.

VCS≒0.67*(COMP - 2.5V)(MULTIN + VOFFSET)

At the time of COMP=2.4V, how does VCS turn out?

Does not the calculation result of (COMP-2.5V) become the negative value?

Or is a way of thinking that VCS becomes 0 right when (COMP-2.5V) is the negative value?