Dual driver mods for single XM-L2's

[RMM]

You can see the drivers in this thread.

[18sixfifty]

@RMM

You can see the drivers in this thread.

Hmm, thanks. I did see that but I assumed it only worked because he was using 8volts.

Can this work with 18650’s in parallel?

[Old-Lumens]

@Tom E

Thanks OL - this takes the guess work out of the wiring. I like the idea of running the battery + directly to the LED(s), so there is no flow through high resistance traces on a driver. Also, the way it looks, the slave 7135's should have better heat dissipation paths than if stacked all on one board because of the additional tracings and wiring of the slave board?

I believe it helps. It sure couldn’t hurt. I have come to the point where I don’t want to stack any more unless absolutely necessary and if I do, then I want a copper wrap to help with the heat.

[Old-Lumens]

@18sixfifty

@RMM

You can see the drivers in this thread.

Hmm, thanks. I did see that but I assumed it only worked because he was using 8volts. Can this work with 18650’s in parallel?

The drivers are in parallel. The batteries are in parallel series only because I need the voltage thru the chips. Otherwise, as long as the drivers are master slave, the batteries can just be parallel for a 3.xx volt led. The master has the zener mod, to protect the mcu and the 7135 chips do need extra heat sinking. If not, the light gets dim very quickly, due to reduced 7135 output. The last time I tried using .010" thick copper sheet and wrapped the drivers, soldering the copper to the tabs of the chips and it seemed to help a lot.

[18sixfifty]

@Old-Lumens

@18sixfifty

@RMM

You can see the drivers in this thread.

Hmm, thanks. I did see that but I assumed it only worked because he was using 8volts. Can this work with 18650’s in parallel?

The drivers are in parallel. The batteries are in parallel series only because I need the voltage thru the chips. Otherwise, as long as the drivers are master slave, the batteries can just be parallel for a 3.xx volt led. The master has the zener mod, to protect the mcu and the 7135 chips do need extra heat sinking. If not, the light gets dim very quickly, due to reduced 7135 output. The last time I tried using .010” thick copper sheet and wrapped the drivers, soldering the copper to the tabs of the chips and it seemed to help a lot.

Thanks again this helps a lot. Your pics in particular were fantastic.

[nwonknu]

Is there any change when connecting these drivers to 2x XML’s?

[Cereal_killer]

Do you want to combined the output’s and then run the emitters hooked in parallel or do you want each individual driver to run one emitter independent of the other (but still controlled from only one MCU)?

[nwonknu]

I don’t know, what is the best way to do it?
My setup is 2x XML-U2, 1x 32650 battery and I’ll order 2x NANJG 2.8A drivers.

[Ledsmoke]

Parallel the drivers like 18sififty and parallel the led´s too. Should give no issues.