I pointed you at the MIC2298 in that thread, maybe someone here can take a look, see if it’s feasible.
Here’s Arduino firmware that can turn it to avrdude-compatible ATTiny1616 programmer:
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 are thinking of a boost driver to do that and yes, I have also thought of the same thing.
Boost on 2 26650s would be even better, but i’d be fine with either setup
From MtnE front page:
I wonder when there will be Narsil though.
guppy should be fine for clicky lights, at least we have more progress
I would also be interested in purchasing 17mm boost drivers. Maybe a few larger ones if 17 is not possible.
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.
To show I’m working on it:
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.
Indeed
[quote=The_Driver]
There are a few that I want.
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?).
Boost and buck/boost drivers are the future IMHO.
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.
No, Bucks do actually work with today’s 3V LEDs, just not for the entire runtime. That’s why buck-boost is great.
The problem with buck-boost is it requires more components. The extra components use more electricity reducing efficiency and makes it harder to fit everything into a flashlight sized driver.
By the time the boost part of the circuit gets used there is so little energy left in the battery it barely offsets the energy wasted by the boost portion of the circuit while in buck mode.
True. It really depends on the LED you want to use. Buck-boost is good for lights with single high-Vf LEDs and a single Li-Ion cell. Buck is good for low-Vf LEDs. Linear is good for medium-Vf LEDs.
Some high-Vf LEDs: Cree XP-G2 (especially the S4 2B), Cree XM-L2, Cree XP-L, Samsung LH351D and the Osram Black Flat.