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UCC28180: VCOMP Test question

Part Number: UCC28180

Tool/software:

Hello, I recently encountered a problem when testing the VCOMP of UCC28180

Below is my circuit diagram

I tried sending different voltages to VSENSE 

When VSENSE=4.5V    CH1:VCOMP  CH2:VGS(GATE)

When VSENSE=2V

When VSENSE=1V

I would like to ask if this waveform is correct because it looks a bit strange.

And should VCOMP be around 5V?  

Please help me. Thank you very much.