Hi to all,

I am doing PCB layout that has 12v and 5v. 12v has 2A load 
and it is used to power leds and 5v is to supply logic.
The board is only 4 layers and I am not sure about power plane
Should I use 12v as part of power plane or 5v. for example

Layer1: 12v
Layer2: signal
Layer3: signal
Layer4: ground  or sould I do this


Layer1: 5v
Layer2: signal
Layer3: signal
Layer4: ground  or sould I do this


Layer1: signal
Layer2: 12v 
Layer3: ground
Layer4: signal   or sould I do this


Layer1: signal 
Layer2: 5v
Layer3: ground
Layer4: signal


I do not have any requirement this is for my own use.
any suggestion will appreciate.

Thanks

Andre

    

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