George,
Yes, I know. I've taken a good bit of data from your site, but
you have 2 different one. A table of IPC (which I'm surprised
they haven't said anything about that one) and a calculator
that isn't from IPC but generated by a formula from some other
gentleman that has done the research.
(I must say I attempted to use that formula and came out with
1 decimal place off.) I'm sure it works but is implementation
into a stand alone - offline calculator isn't there. (unless you are
talking about another one.)
If IPC was a little more friendly to this area you wouldn't have to
have the site at all.
George, I do want to thank you and others like you that have taken
the IPC and other information and made it into a cleaner and
more user friendly version. The personal time you have invested
into supplying other designers, many times goes unappreciated.
I appreciate what you have done and hope you will continue to
clarify information.
I also have a site (www.robertsondne.com) that leans towards
the software I use and the manufacturing aspect more.
Included is some modular notes, stand alone (somewhat)
calculators and such.
I don't want anything except to eliminate the relay of information
to designers. I attempt to add the manufacturer's standards with
IPC/generic design standards so the users may view the full scope
of tolerances and specifications.
Most of these are rules of thumb that I learned, before I learned of
IPC....
More later.
Chris Robertson
[log in to unmask]
> I have a trace width calculator on my web site at
> http://www.aracnet.com/~gpatrick in the "PCB Data" section. It is based
on
> equations from IPCWorks 97 (McHardy/Gandhi, Hughes Aircraft TP SO6-2-1).
>
> There is already some slack in the calculations, but it depends on the
> nature of the surge as much as how much surge current you are handling.
If
> you are worried about a surge that occurs infrequently, for very short
> periods you might be able to go with the calculated value. What I
normally
> do is calculate width at the steady-state current at a 10 degree rise,
> calculate trace width at the surge current at a 60 degree rise, then
decide
> how wide to make the trace based on the time the surge is expected to be
> present.
>
> I am planning on incorporating some "fusing current" calculations into the
> calculator when I get a spare moment. These are based on a presentation
> from Doug Brooks at PCB East 2000.
>
> --
> George Patrick
> Tektronix, Inc.
> Central Engineering, M/S 39-512
> P.O. Box 500
> Beaverton, OR 97077-0001
> Phone: 503-627-5272 Fax: 503-627-5587
>
>
>
> -----Original Message-----
> From: Amira Mohammed [mailto:[log in to unmask]]
> Sent: Monday, February 26, 2001 01:39
> To: [log in to unmask]
> Subject: Re: [DC] Trace width
>
>
> Dear Phil and Gary,
>
> Thank you for both of you
> You are right .When I've asked about this,I told that we want some safty
> factor for surge current , so should I calculate the trace width depending
> on the maximum current value may be take place due to surge current, or
> there is another way to calculate it?
> Thanks in advance
> Regards,
>
> Amira Mohamed
> PCB Designer
> IEP
> www.bahgat .com
>
>
>
> > ----------
> > From: Gary Ferrari[SMTP:[log in to unmask]]
> > Reply To: DesignerCouncil E-Mail Forum.;[log in to unmask]
> > Sent: Monday, February 26, 2001 4:21 AM
> > To: [log in to unmask]
> > Subject: Re: [DC] Trace width
> >
> > Amira,
> >
> > I tend to agree with Phil on this one. The 5 amp current should be a
> > continuos value. Is there any possiblilty that you may be seeing a surge
> > current of a much larger value when you turn on the circuit?
> >
> > Regards,
> >
> > Gary Ferrari
> > Executive Director
> > IPC Designers Council
> > 860-350-9300
> > Fax 413 771-5386
> > [log in to unmask]
> >
>
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