FEDEVEL
Platform forum

wenyuan , 09-19-2024, 04:35 PM

my working company has followed this rules,anyone know why?
in Robert Feranec 's video, place so many components(caps,res) underneath the inductor, but there is placement inhibt in my working company,does any know this rule? or sth about this?

QDrives , 09-20-2024, 02:55 AM

There are many 'theories' about copper, and therefore components, under an inductor.
In short: it depends.
It depends on the inductor, the number of Gnd layers, frequency, but most of all, the sensitivity of your other circuit(s).

Robert Feranec , 09-20-2024, 04:48 AM

what they are worried about? if currents, then in my opinion (I have not simulated/measured it, so I don't have any solid data for this) when there are solid planes inside of PCB currents and fields will be separated. There are also some discussions if to leave it open (without GND under inductor), but that would be a different situation.