Ask an XPert -- Questions for the Power Supply Experts

What might you suggest for the following requirement:

INPUT: 124-240AC

OUTPUT: +12Vdc and -12Vdc at 3A per side

for an audio amplifier application.  The supply could be external or internal, or a combination thereof.  DC/DC converter, switching supply, linear, etc.

Steve,

A dual output AC/DC supply with even split loads like this is not as common as a lot of people think in the OEM market.

In the past we've handled these situations typically in one of three ways.

Option #1 would be to use two single output supplies. For this I would recommend either our ECS45 or ECM40 for the application. The datasheets for each are attached below and more information is available on our website at the links.

Option #2 is to use a triple (or quad) output supply that would have a +/-12V output as well. Typically the extra outputs (like 5V) are needed for some other aspect inside the system so it's actually beneficial to have it.

Option #3 would be to use a higher power 12V unit and then a dc/dc converter to split off the -12V power from the additional +12V power. This may save a bit of space over Option #1, but it's typically more expensive as a 36W dc/dc would typically cost more than a 40W ac/dc supply. Our JCP40 dc/dc converter could be an option for this along with our ECS100 for the main ac/dc supply. Those attachments are below as well.

As usual any of these options could be dependent on other details of your requirement such as thermals, quantities, performance, etc. I would be glad to speak to you in more detail on this if you would like. You can contact me via email at ksmith at xppower.com or you can find your local sales office and speak to a sales person there. The sales offices can be found on our website at: www.xppower.com

Thank-you very much.

Kent Smith

Attachments:

	SF_JCP_060509.pdf
	SF_ECS100_040609.pdf
	SF_ECS45_060509.pdf
	SF_ECM_Series_110609.pdf

Hi,

I'm searching a charger component for a battery  pack of 2 cell LiFePO4 (7,2V or 7,4V) from USB supply.

Havee you  got reference of a charger component who integer step up regulator, or a  step up regulator who can start in short circuit?

Thanks

Yann,

We will need a bit more information about your application. Would it be possible to contact one of our sales offices to discuss further with them?

The main regional offices around the world can be found via this link:

http://xppower.com/page.php?pagename=Offices&lang=EN

Thank-you,

-Kent

Hi Kent,

I'm looking forward an expert in using the LTC3588 circuit. I'd like to know if the advice I'm working in is able to have a goog efficiency with this circuit

or if it will be better to use another one. The goal is to extract informations from a  5 - 20 V piezoelectric signal.

Thanks for your return.

David

David,

I'm sorry, but the LTC3588 is a Linear Technology part and I'm not very familiar with it so I would not want to give you any bad advice. All I could suggest would be to contact Linear Tech and see if they can support you.

If you'd like to consider using one of XP Power's dc/dc converters than I would be glad to help out with that.

Our dc/dc offering can be found on our website:  http://xppower.com/page.php?pagename=DC-DC&lang=EN

Thank-you,

-Kent

Kent,

Thank you for your answer.

I knew that my question was about to go in the wrong way when I wrote it but I was happy to get a mail from you so rapidly.

The subject is really important to me. You see, I've already contact Linear Technology but didn't have any answer in USA. I asked in France to Elisabeth from Farnell and she's the one who told me about this community.

In France, we don't have any direct contect to Linear Tech. The companies here only send the products as branch (is that the good word?) so it's not so easy to find a good ear.

I'll see the webside you already gave me the adress, and perhaps it will be matched?

see you

David,

We do have an office in France with an Applications Engineer there that may be of good resource for you.

The contact info is at this address:

http://xppower.com/page.php?pagename=Offices&lang=EN

You can also view our website in French if you prefer. You select that on the top right side of the page.

If there is anything further we can do please let us know.

-Kent

I have to design a power supply for a system compose for: 1) Control stage ( 5VDC @ 1A, 3.3VDC @ 500mA) ; 2) Audio stage (+/- 16VDC @ 3A); 3)Power Stage (12VDC @ 2A). I want to use a 24VAC CT Transformer (AC INPUT 115VAC) for generate all the supplies, the ac line feed to ac motor (1/2 HP) that is controlled via contactor for the power stage. In early design this system have a lot of troubles for noise, my question is: what type of noise filtering is best suite for this system.

Francisco

Francisco,

I'm not sure I'm going to be the best resource to you for this question as it sounds like you are trying to basically build your own AC/DC power supply.

What type of noise are you having issues with?

Is there a reason to not try to use off the shelf commercial supplies?

-Kent