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'[EE] Wide input range CV LED drivers?'
2010\07\26@130505 by Matt Rhys-Roberts

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Looking for recommendations on commercially available, cool-running, cheap and efficient AC (mains) to DC (power LED) converters. Ideally single chip. Any good or bad experiences?

Thanks
Mat

2010\07\26@170445 by Dwayne Reid

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At 11:02 AM 7/26/2010, Matt Rhys-Roberts wrote:
>Looking for recommendations on commercially available, cool-running,
>cheap and efficient AC (mains) to DC (power LED) converters. Ideally
>single chip. Any good or bad experiences?

What input voltage?  How many LEDs?  Or: what output power?

I've been purchasing some purpose-built modules from Deal Extreme - they are constant-current modules intended to drive either a single large LED or a parallel array of LEDs.  They have several different currents available: the ones I've been purchasing are at <https://www.dealextreme.com/details.dx/sku.13552> and are rated for 3W output (1 LED drop @ 750 - 800mA).  Input is 85 - 265 Vac.

They cost a whopping $2.21 each if you purchase them in 10-lot.

I can't purchase the parts for that cost, let alone assemble them.

DX has larger units available: 10W, 20W, 30W.  That list is at <http://www.dealextreme.com/products.dx/category.410~search.%22led%20driver%22>

Hope this helps!

dwayne

-- Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2010\07\27@085019 by Matt Rhys-Roberts

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 On 26/07/2010 22:04, Dwayne Reid wrote:
> What input voltage? How many LEDs? Or: what output power?

Input range: 110-240vAC, 50/60Hz
Approx. output: 60v DC 50mA constant voltage

I'm trying to get the controller size right down and as cold as possible. Thanks for the link, but those ones look far too bulky at the moment.

regards
Matt

2010\07\28@081546 by Xiaofan Chen

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On Tue, Jul 27, 2010 at 8:48 PM, Matt Rhys-Roberts <.....mattKILLspamspam@spam@nu-ins.com> wrote:
>  On 26/07/2010 22:04, Dwayne Reid wrote:
>> What input voltage? How many LEDs? Or: what output power?
>
> Input range: 110-240vAC, 50/60Hz
> Approx. output: 60v DC 50mA constant voltage

Do you mean constant current?

> I'm trying to get the controller size right down and as cold as
> possible. Thanks for the link, but those ones look far too bulky at the
> moment.

Not sure if Suptertex has something you can use. They
seems to have quite some good things related to high
voltage ICs.
http://www.supertex.com/


-- Xiaofan

2010\07\28@110337 by Dwayne Reid

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At 06:48 AM 7/27/2010, Matt Rhys-Roberts wrote:

>I'm trying to get the controller size right down and as cold as
>possible. Thanks for the link, but those ones look far too bulky at the
>moment.

Gosh - I have purchased a couple of dozen of these modules and I can't see how they can possibly be any smaller.  Did you look at the measurements of the 3W converter?  Its TINY!  The size is dominated by the transformer and output capacitor - almost everything else is SMT devices under the transformer and on the back side of the PCB.  Its width is about the width of my thumbnail and less than 0.3" thick

Some of the other devices I posted a link to are quite large - but so is their power output.  You can't stick a 30W AC-DC in a tiny space.

But the 3W units are really small.

dwayne

-- Dwayne Reid   <dwaynerspamKILLspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2010\07\28@173956 by Gaston Gagnon

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 Hi Dwayne,
On 2010-07-26 17:04, Dwayne Reid wrote:
> I've been purchasing some purpose-built modules from Deal Extreme -
> they are constant-current modules intended to drive either a single
> large LED or a parallel array of LEDs.  They have several different
> currents available: the ones I've been purchasing are at
> <https://www.dealextreme.com/details.dx/sku.13552>  and are rated for
> 3W output (1 LED drop @ 750 - 800mA).  Input is 85 - 265 Vac.
Do you know if the unit could be tweak to set the regulated current to a different value (to 220mA for example) ?
Gasto

2010\07\28@180035 by Dwayne Reid

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At 03:39 PM 7/28/2010, Gaston Gagnon wrote:
>   Hi Dwayne,
>On 2010-07-26 17:04, Dwayne Reid wrote:
> > I've been purchasing some purpose-built modules from Deal Extreme -
> > they are constant-current modules intended to drive either a single
> > large LED or a parallel array of LEDs.  They have several different
> > currents available: the ones I've been purchasing are at
> > <https://www.dealextreme.com/details.dx/sku.13552>  and are rated for
> > 3W output (1 LED drop @ 750 - 800mA).  Input is 85 - 265 Vac.
>
>Do you know if the unit could be tweak to set the regulated current to a
>different value (to 220mA for example) ?

Yep - change 1 resistor.  Note that you can make the current go DOWN but not UP.

DX also has another unit but with half the output current (1.5W instead of 3W).

dwayne

-- Dwayne Reid   <.....dwaynerKILLspamspam.....planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2010\07\28@201714 by Gaston Gagnon

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 Thanks,
Gaston

On 2010-07-28 18:00, Dwayne Reid wrote:
{Quote hidden}

>

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