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I have a board that has a dual voltage isolated DC-DC converter on it.

The converter takes 0 an 5v in and gives -5,0,5 v out.

The 0v of the input is actual ground.

Most of the PCB uses the isolated voltages.

Should I use ground and 5V (input) as my planes?

Or should I use 0v (isolated) for the underside plane, and some other value for the top side plane?

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  • \$\begingroup\$ Show a schematic please \$\endgroup\$ – Voltage Spike Oct 22 '19 at 21:46
  • \$\begingroup\$ The power plane potentials should be those that the components right above are actually using, otherwise the loop area is not minimized defeating the purpose of a plane. \$\endgroup\$ – DKNguyen Oct 22 '19 at 21:46
  • \$\begingroup\$ @VoltageSpike It's essentially an audio opamp circuilt with the opamp being powered from both positive and negative outputs of a DC-DC converter. So I could use the 0v as one plane, but what to use at the other plane? \$\endgroup\$ – Richard Oct 22 '19 at 23:07

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