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Mon, 22 Jun 1998 07:36:47 -0400 |
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We had a similar situation years ago. In our case, we used
multiple vias off an enlarged track to help distribute the current.
In our case, I believe, we had to handle about 30 amps. We
used as many vias (~20) as we could fit into that area and never
had a failure.
Hope this helps somewhat.
Larry Campbell
Supervisor, PWB
BFGoodrich, Avionics Systems
>>> David Baldwin <[log in to unmask]> 06/19/98
01:24pm >>>
Designers Council:
I am designing a board which has heavy current devices,
required to handle
10A max peak. The board will be constructed using 2 oz. copper.
IPC-D-275 5.3.2.3. states:
"Total cumulative copper web for all layers in any plated through
hole
should not exceed .160" for 1 oz. copper, or .080" for for 2 oz.
copper.
The total of the thermal relief cross sectional area divided by the
number
of planes connected to the plated through hole, shall not violate
current
carrying capacity requirements for a given hole.
If the individual web width violates the intended minimum
conductor width
it shall be specified on the master drawing."
If I use the web width calculations, or even the .080" max web
width for 2
oz copper, it's not going to handle the current without getting
really hot.
If I connect the hole directly into the plane, we'll have a difficult
time
soldering it.
What is your recommendations and experience with this type of
situation?
Thanks in advance for your advice and input.
David Baldwin
____________________________________
PCB Designs by Baldwin Tech.
(602) 812-9246 FAX (602) 812-9247
http://www.neta.com/~btech
____________________________________
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