HI :
We tested TPS544B20 EMI.FCC Part 15 Class B Electiric Field stength QP-3M, There are too many test values. Attachment is SCH and test data. Please help us see which parameters we can modify and how to pass FCC. Thank you.PMbus.pdf
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Mark,
I do not see anything obvious. You should look at the switching node waveform to see if there is any ringing that corresponds to the worst frequencies. You are not failing a few individual frequencies, but rather broad ranges. Can we see your PCB layout?
Mark,
Can you tell me about your test environment? Are you testing in a certified lab? In an EMI shielded chamber? What is your noise floor like? Can we see low frequency down to 100 kHz?
We only test the radiation and transmit it to no test. The power supply is 12V lead-acid battery, so we just need to look at 30m ≤ 1GHz. Thank you
Mark,
In order to troubleshoot your issue, we need to see a plot of the noise floor in your test environment as well as a sweep that shows the fundamental operating frequencies in the range above 100 kHz. Also we need to check your pcb layout.