Electronics > PCB/EDA/CAD

Dealing with high current traces with few layers

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eugene:
As you seem to understand already, current carrying capacity is almost purely a matter of acceptable temperature rise. In your case, you could just use the component layer for this current and add a heat sink to the PCB itself. If you're not comfortable with that, then remove the solder mask on that entire area and cover it with solder to increase the cross section. If that still bother's you, then solder down a hunk of copper instead of just adding solder. Add a heatsink and fan if you want. I wouldn't ask the board layers to carry that much current very far, no matter how many layers you have.

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