Just ordered the DX 900 Lumen P7

[Packhorse]

Yeah, RS has them on the NZ site with a 7 day wait which isnt too bad But the cost is around $35 nz inc GST I guess its not much more than Farnell price. Biggest question is how stable will it be as far as current output goes.
Perhaps use a SST-90 and drive it at 6 amps. If it swings up to 9 then thats OK.

 

[gt40]

Packhorse wrote:

Thanks. Problem is I am still having trouble driving it to any where nears its full potential.
Any links on that LDO10C driver?

I bought the following:

1dc/dc converter: LDO10C-005W05-VJ LDO10C-005W05

Source: http://www.arrow.com/

data sheet:http://www.powerconversion.com/products/websheet/170/LDO10C


2. Thermister: KTY83/110

Source: http://avnetexpress.avnet.com

data sheet: www.nxp.com/documents/data_sheet/KTY83_SER.pdf

3. 510 ohm resistor

Source: local Fry's electronics

4. 100 ohm trimmer resister

Source: Fry's

I wired it up according to member Pepko's thread with the thermister and 510 resister in parallel and then the trimmer after them. These are connected between the trim pin and the ground. It is really cool because you can just change the resistance with the trimmer once your close to dial it in exactly at the voltage you want. I used a spare pot to verify the settings and play with some other battery combos and it really works + it is extremely small.

It is rated for 10 amps/50 watts

I got this driver idea from this thread:

http://www.candlepowerforums.com/vb/showpost.php?p=3126980&postcount=19

He posted more info and pics on some other site too: http://forum.fotonmag.cz/index.php?s=&showtopic=804&view=findpost&p=14743

I verified it worked for me so i ordered parts to make 3 for upcoming projects.

FYI, you can make the LDO10c into a boost driver by feeding the trim pin current instead of resister.

It is about 20 dollars in parts and a little solder.



Hope that helps.

 

[Goldigger]

Hopefully George will come up with a better solution with a new Task LED driver...

George if your reading is there a driver on the horizon suited for the SST-50/90??

 

[Goldigger]

I dropped George an email and this is his response...
I have a paper design for a 5A driver that I will be prototyping over the next few weeks. Based on the results from the prototype I'll see about creating a new production driver along with a *flex version.

cheers,
george.

so good news if you can wait a while..

 

[Packhorse]

Here is a thought....

The LDO10C isnt going to deliver a rock steady current ( voltage yes current no).
So how about using a bunch of 7135's after the LDO10C?.
Set it so it delievers just a few tenths of a volt more than required and let the 7135's absorb the rest. It would make for a bulky driver but it would give good protection to the SST's.