New XM-L driver on DX, anyone getting one?

[DmitryCat]

i have new version too
anyone know, what a PWM controller(small chip with 6 pins) on this board?

 

[dinac]

2 VEGASf6 : is this tested in parallel or series connection ?

Or better qestion. it it better to connect 2pcs XML t6 in series or parallel ?

 

[moderator007]

Or better qestion. it it better to connect 2pcs XML t6 in series or parallel ?

Series, they both get the same current and voltage divides.

 

[dinac]

In case of connecting 3 xml-t6 in series will be more or less heat disipation from driver ? Like in case of this driver : http://www.simple-electronics.com/2011/09/high-current-led-driver-using-fet.html

 

[Techjunkie]

I just got new version of this driver :


it hasnt got that secon circular PCB on top like old drivers...

maybe someone has found solution where to tap resistor for full power ?
old PCB vs. new are different....

Any spec change with the new PCB? It'd be nice if the driver memory function were improved on the new boards.

 

[dinac]

no it is same ....

does anybody know where to tap resistor for full power pleaseee

 

[Packhorse]

I think ( only think) that the chip that does the PWM for current control also does the modes. As such I doubt it can be modified to single more.
I hope that I am wrong.

no it is same ....

does anybody know where to tap resistor for full power pleaseee

 

[Packhorse]

pic removed due to size.

As per the thread on the DX review....

Cut the pin from the IC marked in green. Solder a 1K resistor from the IC pad ( not the IC pin) to V+.

(This part is untested. Once the green pin has been cut you could put the resistor from the red pin to V+)

Thanks to Bitloader for the info!

I tried it at 10V and a single XML It drew 1 amp. 2 XML's and current went up to 2-2.2 amp

 

[VegasF6]

I tried it at 10V and a single XML It drew 1 amp. 2 XML's and current went up to 2-2.2 amp

That doesn't sound as though it is operating at a constant current. Have your tried at any other input voltages to see if the output remained the same?

 

[Packhorse]

To get more power out you must put more power in!

I never measured output current. Just input current. Always seemed to be about 10watt for a single LED and 20 watt for 2 in serial.
Based on this I would say its very efficient or not putting out 3amp. My guess its probably a little of both.

EDIT: Driver seems to be 2.7 amp not 3 amp according to previous posts.

 

[VegasF6]

I see. You can look at my measurements in post 33 for efficiency numbers from my testing of the prior model.

 

[Packhorse]

Ah yeah thats where I got the 2.7amp from.:laughing: Thanks for that, Its a great chart!
On my current build I have decided to use one driver per LED so I can switch them individually.

In the pipe line is programming a ( arduino?) chip and have it switch 2 PWM outputs via one piezo switch.

 

[Thr3Evo]

wondering what wattage resistor is recommended for the mod

 

[Thr3Evo]

and also does said resistor go to V out+ or V in+

 

[Packhorse]

I used a 1/4watt to V+in. But I guess what you really meant was what impedance. 1Kohm

 

[Thr3Evo]

no I really meant wattage just to make sure I have everything covered. Thanks

 

[Packhorse]

There is next to no power travelling through that resistor. Any wattage rated resistor will work fine.

 

[Thr3Evo]

Cool, I was looking into driving other projects by resistor only and had to make sure I kept the power dissipation in mind there so I had to ask here as well. Btw the way I read it, the "untested" part is an alternative right?

 

[Techjunkie]

Packhorse, in your tests, did you solder a 1k ohm resistor from the red pin to the pad of the cut green pin? Or did you get V+ directly from Batt+? And is that mod to give single mode? Thanks.

 

[Packhorse]

As per the above post. Cut the IC pin.
Then the resistor goes from green pad (where the IC pin was) to V+
From what I understand the red pad is leads back to the green pad but I have not tested this.