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gEDA-user: Antwort: Re: PCB Ground Plane - Autowiring?
geda-user-bounces@xxxxxxxxxxxxxx schrieb am 03.02.2009 19:07:15:
> I have recently built a board with an LT3510 which provides +6.8V at
about
> 3A for a project (using the two outputs of the LT3510). Efficiency is
88%.
>
> All high current tracks are quite wide and with several vias in parallel
> (except close to the chip since 0.65mm pin spacing really limits track
width)
> where they switch plane. The underside of the LT3510 is also the only
> ground contact and I have small heat sinks on both sides of the board
> (otherwise the LT3510 enters thermal shutdown).
>
> I can send you the PCB file if you want, I still measure about 1 milli
ohm
> between the output of the LT3510 and the final voltage (3mV loss).
>
> Gabriel
Hello Gabriel,
because I'm new to pcb it would be great to have a look on a finished
layout. I would greatly appreciate if you PM me your pcb.
BTW: Is there a formula to calculate the C/W-Value of a plane at a special
position (top, middle, 4-layers, 6-layers...) and size in the pcb? I seen
some recommendations regarding (cooling-)planesize from various vendors
but unfortunaly not for the device I use.
Thanks in advance,
_______________________________________________________________________________________________________________________
cand. Dipl.-Ing. (FH) Marcel Schmedes
Research & Technology
Cockpit Cabin Control
Diehl Aerospace GmbH
An der Sandelmuehle 13
D-60439 Frankfurt/Main
Phone: +49 (0) 69 5805-1712
Mail: marcel.schmedes.extern@xxxxxxxxxxxxxxxxxx
www. http://www.diehl-aerospace.de
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