FreeLists / pcdlist / [pcdlist] Re: CAF

["Andy Shaughnessy" <AShaughnessy@xxxxxxxxxxxxxxxx>]

Louis,
 
Testing for CAF was the subject of PC FAB's April 2002 cover story.
Here's a link to the story - it might be worth checking out.
 
http://www.pcfab.com/mag/0204/neves.html
 
Hope this helps.
 
Andy Shaughnessy
Associate Editor
Printed Circuit Design


>>> louis.guerin@xxxxxxxxxxx 12/05/02 03:23PM >>>

Hi,
I'm searching documentations about CAF (Conductive Anodic Filament)
formation. We are designing PCB's with circuitry generating pulses in
the
300V to 400V range and  having a supply around 450V. I know by IPC
related
documentation which spaces I need to keep, but these values, in my
opinion,
are like to be for a circuitry on the primary side (i.e. circuitry
connected
to the wall plug) which need to withstand spike surge of a few
hundreds
volts and remain operational. Our circuit is isolated from the primary
side
and do not need this kind of extra security.
In the last PCD Design issue (December 2002), Bernard Voss wrote that
the
dielectric strength of PCB's materials are based on a hi-pot test which
is
measured on a short term period. Our circuits have to work 24 hours a
day,
all year round.
Any info on the subject will be appreciated.
Thanks,

Louis Guérin
PCB Designer
R/D Tech Inc.
505 boul. du Parc-Technologique
Quebec, Qc
G1P 4S9

Tel.: (418) 263-3647
Fax: (418) 263-3742
Email: louis.guerin@xxxxxxxxxxx 

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