Bob,
If you have not already found it, check out WWW.ULTRACAD.COM
Doug Brooks has studied and written several articles on this subject.
>From my own personal experience many many years ago, the fusible link is not
very reliable. It is only good as an absolute disaster stopping link that may
blow at 3 amps or may not blow until you reach 10 amps (we were trying to make
it a 3 amp link). It may hang in there for 3 minutes at 8 amps as well. So
don't expect any fine tunability, too many variables and variances for great
accuracy.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2329 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Butcher, Bob [mailto:[EMAIL PROTECTED]
Sent: Friday, November 04, 2005 9:30 AM
To: [email protected]
Subject: [PEDA] How do I design a fusible link into a PCB?
I want to add a narrow circuit trace to a PCB design to act as a fuse.
It should operate with 1 Amp of current continuously and open if the
current exceeds a higher value (2-5 Amp). This project is very cost
sensitive and a 15 cent fuse may be too much. I have the guidelines for
conductor heating vs cross section, and it appears the conductor would
need to be less than 10 mils wide on a 1 Oz copper board. Does anyone
have experience with this subject?
Bob Butcher
[EMAIL PROTECTED]
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