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About AC/DC 5V/3.4A use UCC28700 problem

Other Parts Discussed in Thread: UCC28700

About AC/DC 5V/3.4A use UCC28700 problem

I have question, when i test power of performance by setting Electronic Load  CC mode, 0.3A ~ 1A

VCC, Output power and all SMPS is not stable, what component effect ? .....

otherwise condition SMPS is stable, please help me find out this problem, thanks.