I am designing a PCB which has a 230 Vac power section that has currents up to 10A.
As there are also fine pitch SMD components present (in a low voltage section of the PCB), I try to stick to the standard 2 x 0.035 mm copper PCBs. I can run the high current tracks on both sides of the PCB, so I have 2 * 0.035 mm of copper thickness. For 10A I then need about 3.5 mm track-width.
Using zone’s I can easily create tracks that are wide enough to carry the 10A
The question is about the thermal reliefs for the pads : (mostly THT, one SMD)
- for maximum current there should not be thermal reliefs
- for easy / reliable soldering, I think they are required.
If I have thermal reliefs with spoke width of 0.9mm, then 4 spokes equals the 3.5 mm track-width I need.
What are your recommendations in order to ensure good assembly / manufacturing while still respecting the track-widths ?