Wagner,

Yes, we use this in some of our circuits as well.  I was hoping to work
out a simple circuit which would operate 'stand alone' to fill the
occasional on list request for a regulated voltage inverter, as Roman
has done (in the Buck case) with his Black converter.  I suspect a minor
topology change from Roman's 2 xstr boost converter will fit the bill
however, I would need to see it to know.  Of course, if one is already
operating his (Roman's) Buck converter, the VM/charge pump you have
suggested will work just fine fed from the switch node (if regulation
doesn't become an issue).

Best regards,
Dave

Wagner Lipnharski wrote:
>
> David Minkler wrote:
> > Hi Roman,
> >
> > I'd certainly be interested.  I have a 3 transistor voltage inverter
> > (+5V to -15V) which I was considering posting (not nearly as elegant
> > as your 2 transistor circuits but quite stable).  As you know, we
> > frequently get requests on list for such circuits for LCD contrast and
> > other (low current) purposes.  Perhaps we can adapt your 2 xstr boost
> > circuit to voltage invert.
> >
> > Best regards,
> >
> > Dave Minkler
>
> For most low current negative bias, including extended temperature LCD
> units, we've being using this without any problem;
>
>   any clock signal
>     above 1kHz
>         o
>         |
>        _|_
>        \ /  Any inverter
>         V
>         o
>         |
>        _|_ 1nF
>        ---
>         |
>         o----|<|----o----> -3V
>         |           |
>        _|_         _|_-
>        \ /         === 1uF
>        _V_          |
>         |           |
>        _|_         _|_
>        GND         GND
>
>         1N4148 x 2
>
> /_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> Wagner Lipnharski - UST Research Inc
> Orlando FLorida - USA - www.ustr.net
> /_/_/_/ Atmel AVR Consultant /_/_/_/
>
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