dc-dc converter chip for phantom power

[Lawrence Lucier]

Howdy all......:-)

Looking for recommendations for a dc-dc converter (12vdc input/48vdc
output) integrated circuit so that I can roll my own portable phantom
supply.

Found one such beastie at:

http://www.recom-international.com/html/euroline.htm
RxxTR244872 In 5, 12 Out 24, 48, 72

Any others that fit the bill? Thanks! :-)

[Scott Dorsey]

Lawrence Lucier > wrote:
>Howdy all......:-)
>
>Looking for recommendations for a dc-dc converter (12vdc input/48vdc
>output) integrated circuit so that I can roll my own portable phantom
>supply.
>
>Found one such beastie at:
>
>http://www.recom-international.com/html/euroline.htm
>RxxTR244872 In 5, 12 Out 24, 48, 72
>
>Any others that fit the bill? Thanks! :-)

There are plenty of them and they are all evil. I have used the shielded
ones from Endicott Research and they are okay for noncritical applications
where you can live with some RF trash. All of them are going to require
some extensive filtering on both the outputs AND the inputs.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[martin griffith]

On Tue, 20 Jul 2004 15:47:49 GMT, in rec.audio.pro you wrote:

>
>Howdy all......:-)
>
>Looking for recommendations for a dc-dc converter (12vdc input/48vdc
>output) integrated circuit so that I can roll my own portable phantom
>supply.
>
>Found one such beastie at:
>
>http://www.recom-international.com/html/euroline.htm
>RxxTR244872 In 5, 12 Out 24, 48, 72
>
>Any others that fit the bill? Thanks! :-)
if you want to roll your own, try
LT1533 ultralow Noise1A Switching Regulator from linear.com
http://www.linear.com/pdf/1533f.pdf



martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.

[Arny Krueger]

"Lawrence Lucier" > wrote in message
news:F8bLc.63642$Mr4.39806@pd7tw1no
> Howdy all......:-)
>
> Looking for recommendations for a dc-dc converter (12vdc input/48vdc
> output) integrated circuit so that I can roll my own portable phantom
> supply.

You might want to take a look at the discrete-component alternatives:

One approach is to run a voltage multiplier off of an existing power
transformer winding,

http://sound.westhost.com/project96.htm

http://www.symetrixaudio.com/tech_support/schematics/202_1A0.pdf

http://www.uneeda-audio.com/phantom/phan01.gif

the other is to use a switchmode multiplier running off of an existing DC
supply.

http://www.paia.com/tubehsch.pdf

http://www.rolls.com/data/pb224man.pdf

[Geoff Wood]

martin griffith wrote:
> On Tue, 20 Jul 2004 15:47:49 GMT, in rec.audio.pro you wrote:

> LT1533 ultralow Noise1A Switching Regulator from linear.com
> http://www.linear.com/pdf/1533f.pdf

That's what's used in AKG PT pocket transmitters, FWIW.

geoff

[U-CDK_CHARLES\\Charles]

On Wed, 21 Jul 2004 21:59:23 +1200, Geoff Wood -nospam>
wrote:
> martin griffith wrote:
>> On Tue, 20 Jul 2004 15:47:49 GMT, in rec.audio.pro you wrote:
>
>> LT1533 ultralow Noise1A Switching Regulator from linear.com
>> http://www.linear.com/pdf/1533f.pdf
>
> That's what's used in AKG PT pocket transmitters, FWIW.
>
> geoff
>
>

Any reason why you're not thinking linear instead of switching?

[Scott Dorsey]

U-CDK_CHARLES\\Charles > wrote:
>On Wed, 21 Jul 2004 21:59:23 +1200, Geoff Wood -nospam>
>wrote:
>> martin griffith wrote:
>>> On Tue, 20 Jul 2004 15:47:49 GMT, in rec.audio.pro you wrote:
>>
>>> LT1533 ultralow Noise1A Switching Regulator from linear.com
>>> http://www.linear.com/pdf/1533f.pdf
>>
>> That's what's used in AKG PT pocket transmitters, FWIW.
>
>Any reason why you're not thinking linear instead of switching?

If you are wanting to get 48V from a battery supply, you either need
a lot of batteries or a switcher.

Personally, I tend to go the route of using a lot of batteries.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[U-CDK_CHARLES\\Charles]

On 21 Jul 2004 10:55:38 -0400, Scott Dorsey > wrote:
> U-CDK_CHARLES\\Charles > wrote:
>>On Wed, 21 Jul 2004 21:59:23 +1200, Geoff Wood -nospam>
>>wrote:
>>> martin griffith wrote:
>>>> On Tue, 20 Jul 2004 15:47:49 GMT, in rec.audio.pro you wrote:
>>>
>>>> LT1533 ultralow Noise1A Switching Regulator from linear.com
>>>> http://www.linear.com/pdf/1533f.pdf
>>>
>>> That's what's used in AKG PT pocket transmitters, FWIW.
>>
>>Any reason why you're not thinking linear instead of switching?
>
> If you are wanting to get 48V from a battery supply, you either need
> a lot of batteries or a switcher.
>
> Personally, I tend to go the route of using a lot of batteries.
> --scott

Oh BATTERY . .missed that. Four car batteries'd do it. Or perhaps
better four RV "Deep Cycle" batteries. Probably last four-five years.

[Scott Dorsey]

U-CDK_CHARLES\\Charles > wrote:
>
>Oh BATTERY . .missed that. Four car batteries'd do it. Or perhaps
>better four RV "Deep Cycle" batteries. Probably last four-five years.

I normally use five 9V stacks, which gives you 45V, or six 9V stacks
plus a 48V series regulator (which more than doubles the usable lifetime
if you are using alkalines). It's kind of bulky, though.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Rob Reedijk]

Scott Dorsey > wrote:

> If you are wanting to get 48V from a battery supply, you either need
> a lot of batteries or a switcher.

> Personally, I tend to go the route of using a lot of batteries.

How about a combination? Rechargeables fed by a dc-dc converter built
to less critical specs?

While 9v rechargeables still aren't good enough to handle most applications,
I would think that a low current demand like phantom power would be
do-able.

Rob R.