Has anyone seen transorbs failing for no reason?

[Clarence_A]

<shoppa@trailing-edge.com> wrote in message
news:1105718377.818470.45860@c13g2000cwb.googlegroups.com...

SO sorry, THAT supply IS a cheap PC CLONE!

They're the best of the PC clones, and they claim "1%"
regulation on
the 12V line. I think the original poster is reading too much
into
that. I'm not sure how you do 1% regulation on a 30 amp supply
without
remote sensing and/or busbars...

Look at a much better spec'ed 12V supply like a Lambda linear
and they
never set the crowbar below 14.5V. I may be misreading the
original
poster's intentions but a Transzorb isn't exactly a power supply
crowbar.

Tim.

I called the local office (factory in Taiwan) and he said the spec
was at rated current. That Transorb is not particularly robust.
The Rep also warned about meeting the Minimum current for
regulation.

I have four of these and NOW they tell me it is not recommended
for the application I have. I sized it for expansion, but to use
it I need a Resistive load in addition to the boards to assure
proper regulation. And I was only trying to answer some ones
question. Now I need to find a more appropriate supply!

 

[MM]

<shoppa@trailing-edge.com> wrote in message
news:1105735671.174198.70250@f14g2000cwb.googlegroups.com...

for a eight card expansion, but we are shipping with only

You still haven't really explained why you need Transzorbs on the 12V
bus in the first place. The only reason I can think of might be a
crowbar, but you haven't yet confirmed this suspicion of mine so maybe
there's some other reason.

You confused two posters. Anyways, answering to your question with regards
to why we needed transzorbs in the first place, I think I have already said
that in my opinion we didn't need them, it's been merely a design practice
here to put them on every board on each rail. I should have questioned this
practice, but it slipped through. All I wanted to do now was some sort of
failure analysis to figure out what to do with the systems in the field, not
to discuss how it should have been designed.

/MM