Schoki has been working on a version of this driver that would use a ATtiny85 MCU and thus allow normal BLF firmwares to be used on it for some time now. He has been super busy recently though so not much progress has been made.
Sooner or later someone will get it to work with BLF firmware. The only real question is how small will it be?
the loneoeans firmware is on github on the gxb172 website, so I am thinking if anyone here has skills to modify it to work with narsil or anduril firmware? I will also like to try it with my build to see how we can make it work!
Is it possible to get a boost driver like this to have an output ~9V to run a triple in series (something like XP-L2)?
It’s my understanding that boost drivers are typically more efficient than linear especially at lower outputs? But I haven’t seen this sort of setup before so I’m guessing there’s a good reason why….can anyone enlighten me on this?
Boost drivers tend to burn up when too much current is passed through it. 50 watts as about the most. So maybe 4 amp total at 9 volts (triple 3 volt leds in series). This is quite low for a triple xp-l2.
You could get much more power wiring the leds in parallel then using a FET driver. That’s what most folks do.
While we are discussing boost drivers, can I digress a little ?
I have two spare (yeah, I know) Olight M2R. They are XHP35 lights, so the driver boosts the input voltage of a single 18650 (4,2V and below) to an output of 12V and regulates the current to allow different modes…
Now if I were to make a triple with one of this, and put 3*3V emitters (say, SST20) in series for a total of 9V required, what would the driver do ?
WIll it produces more current ? Is there a risk to burn it ? Or will the current remain the same and the voltage will burn the LEDs ? or no ?
The reason I asked is because I’m looking into making my own headlamp design where I’m specifically needing maximum run times at lower outputs ~200-500lumen range to be able to run all night. Hence why I’m interested in the boost drivers efficiency.
On that note, do we have any freelance driver gurus here that would design a custom pcb for a fee?
Im guessing that it may remove some limitations of present flashlight boost drivers by being able to allow for a larger pcb footprint and also being able to mount flush straight onto the alu heatsink/body.
SST20 would have be my first choice…
I can’t stand CREE tints anymore, they can’t even offer a good tint in their “high” CRI variant
A quad would be an option but the optic would be partially hidden by the bezel so it’s not a viable solution