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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Lowest voltage drop diode
Date: Wed, 25 Sep 2002 07:22:51 GMT
NNTP-Posting-Date: Wed, 25 Sep 2002 00:22:51 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Ben Bradley wrote:
> In sci.electronics.design, firstname.lastname@example.org (oguz) wrote:
> >I am looking for a very low voltage drop diode ( or equivalent circuit
> >) that has a forward voltage drop of 0.2 Volts or less. Maximum
> >current to be conducted will be less than 5mA.
> >Currently, I am using a BAT85 Schottky diode from Philips. This has a
> >forward voltage drop of 0.3-0.4 Volts maximum. I have looked at some
> >Germanium diodes that have a drop of 0.3 Volts.
> >Is there a way to do this with a MOSFET or Transistor ?
> A mosfet, yes. Search for syncronous rectifier.
> >Is a one-way conducting device of 0.2 Volt drop or less achievable by
> >any means ?
> >Oguz Murtezaoglu
> >BiPOM Electronics
Problem with that "solution" is that one needs a large voltage gate
drive that is timed exactly when one wants the FET to be *on*; hence the
name "syncronous rectifier".
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