LMR33630-Q1: LMR33630 EMC issue (1MHz exceed standard 4dB)

Hi Team,

My customer use LMR33630 toign and found EMC CE Testing is exceed standard.

They use LMR33630ARNX, 400kHz QFN.

Sample: 1.13MHz exceed standard 4.4dB; 1.13MHz exceed standard 1.61dB

Here is the SCH.

• May I ask where 1.13MHz come from?The Fsw is only 400kHz…(Is it the overshoot?)
• Would you please give some advice to improve?

Thanks!