Article View: sci.electronics
Article #869Zener overvoltage protection
From: Dave Lauben
Date: Wed, 19 Jul 1989 23:49
Date: Wed, 19 Jul 1989 23:49
33 lines
2117 bytes
2117 bytes
Hello netlanders! I need to protect a differential discrete logic receiver
(54LS32) against fault overvoltage of +/- 32 volts (continuous).
I am not a circuit designer by trade, but this task has fallen to me. My plan
is to use two zeners, but I can't decide which of two configurations would be
more appropriate.
Can anybody point out the relative merits of the two configurations?
My concern is not only how well each would work but also reliability and
failure mode effects...
____ ____
--/\/\/\/--o--------|+ | --/\/\/\/--o----o---|+ |
| | | | | | |
,---' | 5 | | | | 5 |
/ \ | 4 | | | | 4 |
--- | L | ,---' --- | L |
| | S | / \ \ / | S |
--- | 3 | --- ,---' | 3 |
\ / | 2 | | | | 2 |
,---' | | | | | |
| | | | | | |
--/\/\/\/--o--------|- | --/\/\/\/--o----o---|- |
---- ----
Config. 1 Config. 2
If Config. 1 is preferrable, are back-to-back Zeners in a single package the
best way to implement it? How 'bout TRANSORBs -- can they handle continous
overvoltage? Thanks in advance for replys...
-Dave
lauben@star.stanford.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!shelby!portia!dsl From: dsl@portia.Stanford.EDU (Dave Lauben) Newsgroups: sci.electronics Subject: Zener overvoltage protection Message-ID: <3780@portia.Stanford.EDU> Date: 19 Jul 89 23:49:53 GMT Sender: Dave Lauben <dsl@Portia.stanford.edu> Organization: Stanford University Lines: 33