Hi,
I'm using TPS52130A-Q1 in the power management of a device. The PCB layout has been taken directly from Webench. But there are some issues during Conducted Emission Test for CISPR 25. The average for 96Mhz in the FM Band is more than standards of Class 2. Rest of the frequencies are upto standards till Class 4. This seems to be a harmonic of the switching frequency of 2Mhz.
I would like to know whether this is normal as there is no filtering in the design?
Also are there any recommended filters and layouts for the design which can help in reducing these noises? I have looked at some CISPR 25 Class 5 reference designs, so if there is similar one for TPS62130A-Q1 or some recommended parts for the same, please share.
I'm posting the layout images for reference.