I know you do this shit terry!
I have just done the 'correct' calculations for the trace widths on a motor drive i am designing. I have gone for worst case of 15A of supply to the bridge @ 400Vdc. Realistically its probably only going to be around 10A. So using 1oz copper, ambient 25degC and 10degC derating i am coming up with a trace width of ~560mils with a clearance of 103mils. Does this sound right? The connecter I am using is 0.2" spacing so there is no way i can squeeze in a 560mil track with 103mil spacing?
So if I am correct, how the f*ck do you guys get a 560mil trace into a FET? I am using one of those IRAMS beast from International Rectifier, and the spacing between the input and output pins is only ~0.025" I assume a certain degree of taper is permitted on the trace, but where do you find this kind of info?
Further more, IIRC there is some standards (IPC?) regarding clearances for mains rated gear, and IIRC does this not vary for different classes of equipment?
As you can guess, power electronics is relatively new to me.
BTW: on my proto, a 160mil track of 1oz copper worked a treat, but the biggest motor I have is about .4kW so i am probably only drawing around 2A. Not even close to 10A!! I'm going to have to find me a bigger motor.
Andy