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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Mike, I tried UCC3941-5 but it didn't work..
Date: Sat, 09 Nov 2002 01:16:33 GMT
NNTP-Posting-Date: Fri, 08 Nov 2002 17:16:33 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
"Nucharin W. Jansen" wrote:
> I saw your old article. I agree that the pinout are awkward.
> Today I tried UCC3941-5 and it didn't work.
> I just got 2v out from 1 cell ni-cd ( 1.3v )
> VDG got only ~5v.
> I didn't use 10uF and 10v zener diode connect to VDG.
> Is these wrong ?
> I use a small inductor ( look like green resistor color ).
> I hate TI and UNITRODE datasheet.
> Btw, MAX761 and MAX757 work well for me.
> I looking for another high power IC ( 1 cell boost converter ).
> TL499A step up at 40 -50 mA @ 3.6v
> Subject: Re: Voltage "tripler"
> View: Complete Thread (21 articles)
> Original Format
> Newsgroups: sci.electronics.design
> Date: 2001-04-18 00:25:52 PST
> > > > TI has a very useful DC-DC boost chip designed for exactly this purpose. The
> > > > UC3941 will work from .8v to 3v and boost it up to 6v at 100mA. I've used
> > > > tham and found them nice and stable but sensitive to layout and the pinout
> > > > locations are awkward. As to the $5 part, that's what Digikey charges for
> > > > single units, dropping to $3 at 100 units. Plus it needs 3 small caps, 2
> > > > resistors, a coil and a schottky diode.
> > > >
> > > > Mike
> > > >
> > > >
> > > > > Could anybody give me suggestions for a circuit that will roughly triple the
> > > > > input voltage, according to the following specifications:
> > > > >
> > > > > - Cost: Less than $5 for parts
> > > > > - Input Voltage: 1.00..1.4 V DC
> > > > > - Output Voltage: 3.6..4.0V DC
> > > > > - Output Current: >= 30mA
> > > > > - Quiescent Current: <= 20uA
Seems to me that if you do not follow the datasheet recommendations,
that one *should* expect problems.....
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