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5 volt DC power converters



 
 
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  #1  
Old February 27th 04, 05:02 PM
John Ferguson
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Posts: n/a
Default 5 volt DC power converters

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



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  #2  
Old February 27th 04, 05:25 PM
Henryk Birecki
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Default

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 . co.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



  #3  
Old February 27th 04, 07:23 PM
tango4
external usenet poster
 
Posts: n/a
Default

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" . co.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





  #4  
Old February 27th 04, 08:35 PM
Martin Gregorie
external usenet poster
 
Posts: n/a
Default

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?


--
[email protected] : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :

  #5  
Old February 28th 04, 02:42 AM
tango4
external usenet poster
 
Posts: n/a
Default

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?


--
[email protected] : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :



  #6  
Old February 28th 04, 05:44 AM
Richard Pfiffner
external usenet poster
 
Posts: n/a
Default

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" . co.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







  #7  
Old February 28th 04, 08:15 AM
tango4
external usenet poster
 
Posts: n/a
Default

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" . co.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









 




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