FreeLists / pcdlist / [pcdlist] Re: CAF

[Safavi-Bayat Shahed <shahed@xxxxxxx>]

Bonjour Louise
Here are some articles I hope be helpful.

1) smaplab.ri.uah.edu/lce/turbini.pdf
2) http://www.pcfab.com/pdf/0207/07amla.pdf

3)
http://www.cmap.ca/open/events/2002May_Reliability/presentations/Turbini=
%20C
AF.pdf

4) =
http://www.testronics.com/Application_Note-Backplane_Voltage_Testing.htm=


5)
http://www.circuitree.com/CDA/ArticleInformation/features/BNP__Features_=
_Ite
m/0,2133,79336,00.html

6) http://www.gotroconsulting.com/publications/paperlaminate.pdf


Bon Chance,


Shahed

-----Original Message-----
From: louis.guerin@xxxxxxxxxxx [mailto:louis.guerin@xxxxxxxxxxx]
Sent: Thursday, December 05, 2002 3:23 PM
To: pcdlist@xxxxxxxxxxxxx
Subject: [pcdlist] CAF



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 Gu=E9rin
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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