[SI-LIST] Re: How to create a "fuse" in a PCB?
- From: "Matthias Mansfeld" <m.mansfeld@xxxxxxxxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 27 Jan 2016 21:42:42 +0100
On 27 Jan 2016 at 10:14, Jeff Loyer wrote:
Can anyone share their experience(s) with designs that have failed due to
excessive heat caused by excessive current in their PDN?
Exactly this topology with a thin thin trace between wonderful
planes... been there, done that (almost...) ML 4 layers, split planes
for 2..3 different supply voltages, everything perforated with many
vias, and thus (via clearances and plane shapes together) formed an
unintentional fuse.... Normal DRC and connectivity checks found
nothing, but luckily I saw it during final visual checks on final
gerbers...... I guess with 1 oz copper the "fuse" had eventually
blown by charge current of two really fat elcos in the
neighbourhood.......
Best regards
Matthias Mansfeld
PS.: I could tell also stories about intentionally made "fuse"
traces, which worked absolutely perfect for the intended purpose (to
get a more or less controlled, spectacular but encapsulated
self-murder on a frequency inverter instead of relying on a properly
rated fuse in the power distribution...)
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
