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From: "Klaus Vestergaard Kragelund"
Subject: Two diodes in series to double PIV rating - is that a "no-no"?
Date: Wed, 20 Nov 2002 22:29:28 -0500
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Organization: TDC Internet
I have designed a low power flyback supply and I'm using a BAV74 diode for
one of the secondary outputs.
Trouble is that the PIV (Peak Inverse Voltage) on the diode is very close to
the allowable rating for the diode. Is it possible to connect two in series
(like the BAV99 series- two diodes on one die) to increase the PIV rating?
Will the applied voltage split approximately equally between the diodes -
even at fast switching?
I would suspect that if one of the diodes has a higher reverse leakage
current from the "get go" - then the bulk of the voltage would be impressed
on the other diode. But when the voltage on the other diode rises - so does
the leakage and possibly a equlibrium would exist. Anyone?
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