Driver Mod For up to 1.8amps with 2x 3.7v or 3.0v cells

lazeerer · Jan 22, 2011

steviedezie said:
ok this is a double post because i posted in another thread started by lazeerer about these cheap drivers from DX, goodluckbuy, etc. my other post in detail here.

basically im using the DX 18V 5W LED driver and it does put out 1.25A pretty well and stable when on a test load of 5 1n4007 diodes, but when hooked up to a 445 nichia blue, it its bright as heck for about 2 seconds and dims... dim to the point where it even changes modes, like it almost looks like a TEM00 (vs when its bright i can clearly see the lines) it does this every time. turn it on, bright for 1-2 seconds, and then dims... tried a piece of aluminum on the driver which is sandwiched between the driver and the pill and still same thing. batteries are brand new ultrafire 18350's which put out 4.04V under load and im sure can easily deliver the 1.24A the driver puts out. NOTE: when hooked up to a test load with DMM measuring current through a 1ohm resistor, the driver puts out a constant current of 1.24A for well over 30 secs...

EDIT: im using 2 18350 btw...

so why the dimming issue when attached to the LD???

tested LD with a regulated PS going through a LM317 with input/output caps labby style driver and it is bright as hell.

i hope my problem is an isolated issue since i already have more on the way but since DX ships at a snail's pace, i really hope someone could give me out insight on this issue because i already waited 4 weeks for this driver and i really would hate to wait another 4 weeks just to have a handheld 445.

thanks!!

No need to double post man give me a second to type GOD.. look at the other thread you posted this same Question in.

alf638 · Jan 25, 2011

Thanks for the good idea, i'll be trying this for sure.

P.S We have the same multimeter

lazeerer · Feb 3, 2011

Hey guys alittle Update on the driver. It is the V2 setup and the Efficiency is impressive:

Look for yourself: Videos is a Little boring but i find it enjoyable.:na:

Only drops 24mA over 5 minutes.:wave: Thats Awesome.!!!

Garoq · Feb 3, 2011

lazeerer said:
Hey guys alittle Update on the driver. It is the V2 setup and the Efficiency is impressive:

Look for yourself: Videos is a Little boring but i find it enjoyable.:na:

Only drops 24mA over 5 minutes.:wave: Thats Awesome.!!!

Excellent stability!

Blord · Feb 13, 2011

I am ordering some resistors with this mod but what wattage resistor do I need ?
The following options are avaiable : .25W , 1W, 2W, 3W, 5W etc.
I want the resistors as small as possible to fit the Aurora C6 host.

Elektrotechniker · Feb 13, 2011

Blord said:
I am ordering some resistors with this mod but what wattage resistor do I need ?
The following options are avaiable : .25W , 1W, 2W, 3W, 5W etc.
I want the resistors as small as possible to fit the Aurora C6 host.

You need SMD resistors. Get as higher wattage as possible i guess?

Humphry · Feb 15, 2011

Blord said:
I am ordering some resistors with this mod but what wattage resistor do I need ?

I was wondering the same thing. My limited electrical knowledge would assume a 1/4w would be sufficient MAYBE a 1/2w, we want to save space but let's see what Laz has to say.

lazeerer · Feb 15, 2011

You need to get as highest as possible. 1Watt or more. I found anything less then that is not stable. When using through hole resistor.

So its going to be tight fit. As you want to be able to heatsink the 8 pin cheap too.

Blord · Feb 16, 2011

Thanks for the info. I have already ordered the 1 Watt version. Hopefully the shop can change it to 2Watt before the shipping.

Yes, heatsinking the chip is a good idea with this kind of current.

Elektrotechniker · Feb 16, 2011

Blord said:
Thanks for the info. I have already ordered the 1 Watt version. Hopefully the shop can change it to 2Watt before the shipping.

Yes, heatsinking the chip is a good idea with this kind of current.

It is a MUST

Blord · Feb 20, 2011

I got my drivers from Dealextreme. It is the 4-pack version, $6.97 - 3.6V~9V 800mA Regulated IC Circuit Board for Cree and SSC LEDs (4-pack) - DIY Parts & Tools
Without modification the ouput is around 700-800mA just like the spec. The resistor value is R270 and is different from the driver, $1.99 - 18V 5W Cree Circuit Board for Flashlights (16.8mm*5.5mm) - DIY Parts & Tools which is R200.
The overal build is worse than the single pack driver.

I remove this smd resistor and place it on the same resistor of another board. I have now two R270 stacked on the same board. The new value will be R135.
The output is now a whopping 1.8A current. The beam of 445nm is noticeable brighter than my Hotlight 1.3A. The bad thing is that the host is heated so fast the runtime is 10sec or less. Otherwise something will go wrong.

The board without the resistor is re-used for the LCC red diode. I put two metal resistor of value 1.0Ohm and 1.8Ohm in parallel and the output is a nice 360mA. Just good for this diode.

lazeerer · Feb 20, 2011

^^ Make sure you LOC Is not Shorting with the board . You have to insulate the diode from the Driver. If you dont you will Direct drive the diode from your battery source.

Also Make sure that the Senkita Diode is an SS34 not a SS14. If its an SS14 it is only rated for 1A.

This mean that the driver will only be rated up to 1A. Anything after that you are risking it.

The boards from The Original post had SS34 schottky diode but now i see there SS14 on DX site New Pictures.

Also Mine came in Higer then what your stock was ~ 960mA

Iam waiting to get more in. My four pack that still has not arrived yet to see if they are different from My OP. Its been since the OP since i got them in. They dint ship them to me on my last order witch they should have came in and they sent me a piece of paper tag that said pending or something of that nature. I hope they dint change the circuit.

Also those Resistor stink that come on the boards. Is it Exactly 1.8A.?

.13.5Ohms should be giving you higher then 1.8A ~1850mA.

What does yours say.?

I would say stick to the Other Board and use these for Lower then 1A Build. "Blu Ray". They are also cheaper if you buy 5 or more and are the ones iam using.

Edit:
I will edit the first post.

Blord · Feb 20, 2011

It stabilizes around 1800mA. I sink the chip to the host with a piece of alumium like you did.
The Aurora C6 host is too small for 1.8A 445nm. It can't cope the heat.

lazeerer · Feb 20, 2011

Is it a SS14 schottky diode or a schottky SS34 diode.?

Hmm. I have a C6 host with a copper heatsink and i get > then 1 minute run time. before it gets to warm for my liking.

bhwollen · Feb 20, 2011

Hey man this is great! You kinda lost me though :yabbem: Can you send me a link for a resistor to get 1.8 watts stable with the 2 buck driver? Thanks!

Blord · Feb 20, 2011

lazeerer said:
Is it a SS14 schottky diode or a schottky SS34 diode.?

Hmm. I have a C6 host with a copper heatsink and i get > then 1 minute run time. before it gets to warm for my liking.

The drivers in the four-pack are SS14 and the single driver version has SS34. This driver has also better build ( better soldering and pcb )

Driver Mod For up to 1.8amps with 2x 3.7v or 3.0v cells

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