Harini,
Most of the online and offline calculators are based on
IPC-2152, lineage is based on IPC-2221 (section 6.2),
IPC-D-275, IPC-TP-117, MIL-STD-275, NBS Report #4283 from 1956.
The data is based on assumptions of relatively isolated
trace, IPC-2152 test methods are defined by IPC-TM-650.
IPC-2152 refines the data a lot, but most layout people use
the "All environments" nomographs, as safe guideline.
Shorter traces, presence of additional metal in the PCB, and
other mechanisms of decreasing thermal resistance allow
smaller traces with same temperature rise.
In addition to keeping trace temperature below copper fusing
point you need to consider reliability, PCB material Tg, etc.
You are generally safe with these standards and the
calculators that use them, but if you have to push the limit
IPC-2152 has information that can help. And/or you can use
thermal simulation tools.
Regards,
Ivor
On 12/3/2015 6:04 PM, Cristian Gozzi wrote:
Hi
Try the free tool from Saturn pcb... It's very great and can compute the
trace width vs copper weight and Max temp. Rise you want to accept...
It does the job for both external and internal trace as well for the VIA
I hope it helps
Cristian
On Thu, Dec 3, 2015, 3:41 PM Harini Ranjith <hariniparthiv@xxxxxxxxx> wrote:
hi Experts,
I need some guidance on how to calculate the trace width for High Voltage
AC line (80-240V) in PCB and maximum current shall go to 30A.
If I use conventional Trace width calculators available in web, it
calculates to very large trace widths 645mills in external layers and
248mills in internal layers with 2oz copper thickness.
Thanks in Advance
Harini
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