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LM5175: Buck Boost on LM5175EVM shoot down with unstability

Enrico Sguerri
Prodigy 30 points
Part Number: LM5175

Hi,

I'm testing the LM5175, using LM5175EVM board with an input 12.5V, suppling a PC card with a stress test that is working.

I don't exactly which is load profile that the tool generate but I didn't detect too much high peaks of current; sometimes the 12V output voltage of the controller drops down of almost 4V without an apparent peak of current but always concurrently with a sort of unstable behavior.

In the sreenshot are present the 12V output in Yellow and the voltage on the current sense CS resistor (R15) in Green.

Any idea what may causes this instability and the drop voltage?

Thanks