It can drive 3V LED with any voltage up to 20V, but this is linear driver,it burns extra voltage into heat. This driver is good when voltage of LED and battery are similar, like 2S cells and XHP50.2, XHP70.2.
In combination with mosX MCPCB generated heat in mosfet is not problem at all,since it's well cooled on mosX. Second generation of XHP50 and XHP70 have very low forward voltage, so they draw too much current with DD drivers which can lead to LED death or at least low efficiency because of too high current. Efficiency is equally bad in all modes that are derived by PWM of DD mode. Also 7135 regulators have max. operating voltage lower than 8.4V, so reliability is questionable when they are used in 2S setups.
This drivers provides constant current on all modes, so there is no problem with too much current on high mode, LED efficiency is max. possible in all modes. Disadvantage of CC method was extra heat generated in driver(mosfet to be precise) - that is completely solved with mosX board because mosfet is on same MCPCB as LED.
I filled my Jaxman M8 with Led4power’s components, led driver mcpcb tailswitch and springs too. link to pics . By now most of my collection has at least something from this store inside, a good testament to how much I like the stuff but I’m going to have to try to do something different in my next build not to let things get too boring .
I know dielectric thickness is 35um,dielectric conductivity is not specified directly, but based on some other numbers I calculated that it must be around 10W/mK.
So it should be equivalent to ~160um of PbSn solder layer thickness (I calculated this before as 200 something um,but that calculation was wrong).
Most of DTP boards have that order of magnitude DTP pad height variation, so performance in theory should be DTP-like for most LEDs, to check this I will do some DTP vs mosX tests for several LEDs.
Thanks. The central solder pad of the Osram Black Flat has an area of 3.06mm2.
So the thermal resistance of the insulating layer when using this LED is: 35μm / (10W/m*K * 3,06mm2) = 1,144°C/W
Add this to the 0.027°C/W of the aluminium PCB (1.6mm thick, 210W/mK) you get 1.171°C/W.
With 22W (maximum measured by Köf3, can vary quite a bit, I assume 80% efficiency) it thus adds ~20.6°C to the temperature of the LED.
Assuming perfectly even solder pad height a 20mm copper Sinkpad PCB would add less than 1°C (0,0147°C/W).
So while you're PCBs are a great idea, I agree with you in not reccomending them specifically for the Black Flat (most people use this LED at close to maximum power). Does your supplier offer other insulation materials?
Added soldered Luxeon Vs on various mosX boards, also variants without mosfet/NTC for direct replacement in many lights like Convoy triples and Emisar D4 quad :