AMC3330: DC/DC switching frequency

Thank you, Eva, for the information and tech note link.

The inquiry is due to emissions issues.
The customer has an issue with EMC compliance for CISPR25 which uses both the AMC3330 and AMC3302.
The emission results show exceeding all limits for the CISPR25 FM range near 89MHz center frequency.  The design also has a TPSI3050 (see other E2E thread) which may be the contributor for the 89MHz.
However, for the AMC3330 and AMC3302, they see peaks at 31MHz and ~93MHz.

The tech note you provided mostly references CISPR11.  Do the same techniques apply for mitigating for CISPR25?  Or should other methods be used?

Is the peak at 90MHz expected from the AMC33xx?

Hi Brandon,

The AMC3330/2 may react with the TPSI device, depending on the schematic/layout. If those can be provided we can conduct a more thorough review.