power trace width
wenyuan , 02-02-2024, 11:49 AM
how to define power trace width,somtimes it 's bigger than padsize,sometimes it 's 10mils,20mils,or even more bigger,what rule should i follow ?
Mini , 02-02-2024, 02:26 PM
I would recommend using Saturn PCB Design for calculations. I think Robert has shown it in the videos as well. In short power trace width depends on current. Bigger the current more copper you need. More copper = lower DC resistance. Since outer layers are 1 oz generally and inner layers are 0.5 oz(unless you pay extra) then you have to take that into account as well. Outer layers also give heat away better. Everything is about heat.
Mini , 02-02-2024, 02:29 PM
Also looking at your table i see many different voltages - when it comes to voltages then for higher voltages you need higher clearances between the tracks from other potentials.
QDrives , 02-02-2024, 05:02 PM
For wide traces compared to pads there are 2 (or 3) things to consider:1) If you have the space and need width, just the wider trace to connect to the pad.2) If the clearance does not allow this (ie. getting to an SO package) you need to decrease the width closer to the package.3) Just as @Mini mentioned, you need to keep track of the clearance too.
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