Hi Roy,
What is your reason behind splitting the Planes? Do you want to isolate the
DC/DC converter noise from the remaining circuit? This can be done, but isn't
necessary and the risk of EMI Problems rises. You can create the same effect if
you keep the complete DC/DC converter circuit dense and at the perimeter of
your PCB to create a close loop inductance and avoid having other GND-returns
travelling across that area. If this is done correctly, then it makes almost no
difference if you have split planes or a solid plane. If this is not done
correctly, then the split will create EMI and SI-Problems while with the solid
plane you will just see more noise in some areas.
Try to start routing using a split plane and check for all return currents if
they stay on their plane, and then in the end combine the planes to a solid
plane. I think having a visible separation of planes does help during routing
and placement.
BR
Gert
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Roy M.
Sent: Tuesday, January 24, 2017 5:57 PM
To: si-list all <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] GND separation with "same" voltages
I have a 24V input to a DC/DC converter, output is 3.3V.
the 24V is also passed to an opto-coupler (diode side) while the secondary side
(NPN) has a 3.3V. So the opto-coupler is used as a level shifter.
I thought about separating the grounds for the opto-coupler. The input 24V will
has a gnd1, while the 3.3V will has a gnd2. But, the 3.3V is transformed from
the same 24V passed to the input of the opto-coupler (which has a different
ground).
In this situation, will this give good results in terms of EMI, SI, point of
view?
Thanks all!
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