Buck/boost drivers are reasonably simple to make with up to ~2-3A max on either the input or output, whichever is higher. Once you go much above that it gets exponentially harder to keep everything in check.
The 7135 drivers are fine for what they are, basic and cheap but they do the job.
How about a buck driver that fits an L6, with narsil, and 12v 2.5a output. I’d love to build one with an xhp35hi. I would be happy to use 4 x 26350 in it. Slightly more reflector over the l2 version and ramping fw. I would hope for a bit better throw over the l2 for that reason.
I was thinking zener modding a fet setup, to get the input side sorted, but i have no idea how i’d regulate it to keep the led at 2.5a. Buck seems like a better plan, but i don’t see them done on that platform.
You will need to see Lexel about that. I just recently heard he got some help to get NarsilM working on his high powered boost drivers. No word on when they will be available, though. I hope soon.
Iirc, Richard doesn’t use NarsilM. He may adapt RampingIOS (the D4 UI) to work later on, though.
So, do we need to take up a collection for you guys? I’d be happy to throw in a couple bucks to push the boost driver forward. I figure there are others who would do the same.
1. 1S Buck-Boost Driver for 2.8-4V LEDs which does up to 5A, but it configurable down to 3A. Controlled by eswitch with many low modes (like Zebralight), overtemp and overdischarge protection. Maybe also a version for clicky switches. [/Quote]
I just found out here that Zebralight used the TI TPS63020 buck-boost IC in the SC62. It does up to 3A from a single Li-Ion.
I would love to have a similar driver as an aftermarket part, especially with an even higher led current.
This TI chip can go down to a Vin of 1.8V, so it can also be used to drive UV LEDs (at less than 3A).
The TPS63027 looks like a good candidate because it can deliver a high output voltage of up to 5.5V.
The MAX77816 might be another good option. It can deliver 3A in boost mode.
I would be looking for a 1 cell boost driver. But I just started building and flashing my own drivers, therefore I am not a useful contributor or not to the extent like the pros on here.
Not sure which emitter should be used either, maybe a 6V one and some good amperage behind it (around 2A-3A maybe?).
We have reached the max of what we can do with a single 3V LED with 1S input some time ago from a driver standpoint.
Buck only really works if you have a higher input voltage then the LED (aka, 2S for a 3V LED, 3s for a 6V LED ect) and this is not generally possible without making lights un-necessarily large.
I would be happy with a 2S/2S2P/3S 12v. boost driver for the XHP35/70.2 12v emitter @ 2.5-10amps in a 22-42mm diameter, that could take the heat and be reliable.