This was my first time designing PCBs, so I apologize in advance if this sounds dumb...
I'm making an ATX PSU adapter for old computers that didn't use this standard. There wasn't much electrical engineering involved, it's pretty much a "converter" (i.e. re-routing) board. I had calculated my track widths based on 2 oz copper layers. Now that I got quotes back from PCB manufacturing houses, I'd rather use 1 oz copper layers because it's much much cheaper.
Here's what I'm working with:
- 120 VAC: max 6 A power draw (per track). My tracks are 3 mm (120 mils) wide.
- 5 V (motherboard): max 3 A (per track). Tracks are 2 mm (80 mils) wide.
- 12 V (motherboard): max 5 A (per track, worst case scenario, probably less in real life). Tracks are 2 mm (80 mils) wide.
- 5 V standby: 1.25 A, 1 mm (40 mils) wide.
- "Molex" power connectors: I can't seem to find an actual max current spec, but 16 AWG can work up to 10 A apparently. The tracks are 2 mm (80 mils) wide.
Should I make my tracks wider or is this sufficient?
I've seen that temperature rise is an important factor. Bear in mind that the PCBs will be cooled by a massive fan.
Thanks in advance for your help.
EDIT: I already tried online calculators and obtained the following results (please check the widths I have vs. temperature rise). I don't know how much these can be trusted... 80°C for the HD connector doesn't seem right.