I'm needing to design a PCB for power distribution. I have a 90W (5V 18A) power supply that will be responsible for powering 5 USB Type A outputs, each USB drawing up to 12.5W (5V 2.5A) MAX.
I'm used to PCB layout for low power digital electronics but this will be the first time designing something drawing this much current.
Am I just able to use a top layer polygon pour for 5V, and then the bottom layer polygon pour for ground? Or is there a reason I should have a thick trace (2oZ copper(?), thick width(?), solder on top of trace(?)) with each USB drawing off a main rail (like in the digram below)
I'm just trying to workout whether to trace or polygon pour to ensure my PCB can handle up a potential of up to 12.5A draw.