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LM5116: LM5116 load issue

Part Number: LM5116

Hi Tiers:
I use the LM5116 in my DC/DC project

input:50V

ouput:12V1A

when the load is CC<0.6A, all waveforms are normal.

but when the load is CC>0.6A, the waveform is not normal, just as below:

C2 is low-side MOS gate driver

C3 is the Inductive current waveform

All the SCH parameters are from the Webench.

Could you give me some suggestions to deal with this issue?  thx