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LM27403: About bode plot test

Part Number: LM27403

Hi TI expert,

We recently met an issue about bode plot test. The phase is abnormal when the load current is 3.5A and 7A from 1K-10K. We tried to adjust the zeros and poles. Still have not found a solution yet.

Has this issue been seen on LM27403 before? Please advise what may cause this.

Vin 12V

Vout 5V

Cout: 330uf/16mohm 2pcs

Lout: 2.2uH

Iout max:7A

Temperature: room temperature

Iout=7A:

 Iout=0A

 Schematic is as below.

Thanks,

Dora