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ADM2587 EMC failed

Question asked by HansXie on Dec 20, 2017
Latest reply on Dec 21, 2017 by HansXie

1) Radiated Emission issue is solved. But failed in Conduction Emission test.

2) The Conduction Emission exceeds standard below 2 MHz (testing range is 150kHz~30MHz). We though it could be caused by the isolated dc-to-dc converter of ADM2587E. to add ferrite bead (high Z at 2MHz) and 10pF, 1uF, 10 uF ceramic capacitor on Visoout, and adjust RC filter on AB lines, but it still failed.

3)  uses 2-layer PCB. Customer doesn't want to change to 4-layer PCB for cost reason and they don't have enough time to adjust PCB layout totally.