I am building a board to power solenoids. The solenoids require 40amps to open. I am using a P-Type MOSFET to supply each solenoid. Attached is a drawing of the board. My question is supplying the voltage to the MOSFETS. I am assuming that a power plane across the board is going to be the best I can do. I also know a ground plane is good to have in a design as well. All of the components are on the top layer and it is a two layer board. Can I flood the entire top layer with the 12v input to help out with the supply to the MOSFETS and use the bottom layer as the ground plane and not have any problems? Better yet, can I put a power plane on about a third of the bottom layer and the other 2/3rd of the bottom layer a ground plane? Meaning have the ground plane on the bottom layer underneath the PIC chip and other components, then have the power plane on the bottom layer, along with the full top layer, just underneath the MOSFETS and connect to the top plane with multiple VIAs?
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