5 volt DC power converters

[John Ferguson]

Some time ago I noticed in a post a link to a DC/DC
converter IC. I'd like to investigate these and would
appreciate a repost if possible. I have tried searching
the archives but can't come up with the right search
phrase or the post is older than I remember.

Thanks,

John

[Henryk Birecki]

Look at National Semiconductors site. ICs LM2756 and LM2754 depending
on your current draw. Also look at application notes that will come
up.

Henryk Birecki

John Ferguson o.uk>
wrote:

>Some time ago I noticed in a post a link to a DC/DC
>converter IC. I'd like to investigate these and would
>appreciate a repost if possible. I have tried searching
>the archives but can't come up with the right search
>phrase or the post is older than I remember.
>
>Thanks,
>
>John
>
>

[tango4]

Power Trends ( Now Texas instruments ) 78HT205HC
http://www.internationalsoaring.org/78hc205.pdf

10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal
operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run
a completely flat iPaq with the backlight on!

PS: I have a several tubes full of them if you want one or two !

Ian


"John Ferguson" o.uk>
wrote in message ...
> Some time ago I noticed in a post a link to a DC/DC
> converter IC. I'd like to investigate these and would
> appreciate a repost if possible. I have tried searching
> the archives but can't come up with the right search
> phrase or the post is older than I remember.
>
> Thanks,
>
> John
>
>
>

[Martin Gregorie]

On Fri, 27 Feb 2004 18:23:26 +0000 (UTC), "tango4"
> wrote:

>Power Trends ( Now Texas instruments ) 78HT205HC
>http://www.internationalsoaring.org/78hc205.pdf
>
>10 - 32 volt in. Switching regulator very high efficiency up to 90% ( normal
>operation fully charged iPaq ) and up to 2 Ampere out - Will charge and run
>a completely flat iPaq with the backlight on!
>
>PS: I have a several tubes full of them if you want one or two !
>
Is that the tiny PCB I found in a Car lighter adapter cord for an IPAQ
3850?


--
martin@ : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :

[tango4]

Could well be the same sort of thing - a small switching power supply - but
these are actually in a plastic housing.

Ian

"Martin Gregorie" > wrote in message
...
> On Fri, 27 Feb 2004 18:23:26 +0000 (UTC), "tango4"
> > wrote:
>
> >Power Trends ( Now Texas instruments ) 78HT205HC
> >http://www.internationalsoaring.org/78hc205.pdf
> >
> >10 - 32 volt in. Switching regulator very high efficiency up to 90% (
normal
> >operation fully charged iPaq ) and up to 2 Ampere out - Will charge and
run
> >a completely flat iPaq with the backlight on!
> >
> >PS: I have a several tubes full of them if you want one or two !
> >
> Is that the tiny PCB I found in a Car lighter adapter cord for an IPAQ
> 3850?
>
>
> --
> martin@ : Martin Gregorie
> gregorie : Harlow, UK
> demon :
> co : Zappa fan & glider pilot
> uk :
>

[Richard Pfiffner]

You get an extra bonus with these converters, it happens on 123.0 123.3 and
123.5 and many other frequencies I would guess, especially on Becker Radios
a loud squelch hiss sometime with the 2 second GPS pulse sometimes constant.

Richard

"tango4" > wrote in message
...
> Power Trends ( Now Texas instruments ) 78HT205HC
> http://www.internationalsoaring.org/78hc205.pdf
>
> 10 - 32 volt in. Switching regulator very high efficiency up to 90% (
normal
> operation fully charged iPaq ) and up to 2 Ampere out - Will charge and
run
> a completely flat iPaq with the backlight on!
>
> PS: I have a several tubes full of them if you want one or two !
>
> Ian
>
>
> "John Ferguson" o.uk>
> wrote in message ...
> > Some time ago I noticed in a post a link to a DC/DC
> > converter IC. I'd like to investigate these and would
> > appreciate a repost if possible. I have tried searching
> > the archives but can't come up with the right search
> > phrase or the post is older than I remember.
> >
> > Thanks,
> >
> > John
> >
> >
> >
>
>

[tango4]

I have a Becker in the Ventus and i don't have a problem with it at all.

Ian


"Richard Pfiffner" > wrote in message
...
> You get an extra bonus with these converters, it happens on 123.0 123.3
and
> 123.5 and many other frequencies I would guess, especially on Becker
Radios
> a loud squelch hiss sometime with the 2 second GPS pulse sometimes
constant.
>
> Richard
>
> "tango4" > wrote in message
> ...
> > Power Trends ( Now Texas instruments ) 78HT205HC
> > http://www.internationalsoaring.org/78hc205.pdf
> >
> > 10 - 32 volt in. Switching regulator very high efficiency up to 90% (
> normal
> > operation fully charged iPaq ) and up to 2 Ampere out - Will charge and
> run
> > a completely flat iPaq with the backlight on!
> >
> > PS: I have a several tubes full of them if you want one or two !
> >
> > Ian
> >
> >
> > "John Ferguson" o.uk>
> > wrote in message ...
> > > Some time ago I noticed in a post a link to a DC/DC
> > > converter IC. I'd like to investigate these and would
> > > appreciate a repost if possible. I have tried searching
> > > the archives but can't come up with the right search
> > > phrase or the post is older than I remember.
> > >
> > > Thanks,
> > >
> > > John
> > >
> > >
> > >
> >
> >
>
>