I am very impressed and if you should decide to brings these to market I’d certainly be interested in at least 4-5 of these drivers.
Just start a thread or continuance here maybe and post a notice and I’ll be there, thanks for sharing your project it’s fantastic.
Edit: Maybe an interest list would give you an idea of what might be possible and needed for your parts etc.
Wow, very nice!
Very impressive and very well spaced modes. Congratulations!!
I love it when a plan comes together
Well done, loneoceans! It’s great to see some real-world test results. Now only to… (1) find a way to make a 17mm version, and (2) find a manufacturer to produce them on your behalf, to your exact specs 
Why not create an Oshpark project?
:+1:
Very nice!
How about an additional moonlight mode? How low can this driver go (without flickering)?
Awesome job!!
I want one! Maybe more than one depending on price. :sunglasses:
Sounds like this is what I need for the Nichia 144A’s I bought from Clemence/TA being able to use a single cell. Nice job loneoceans
From wo to go you have amazed. What an effort. 
Simon, are you reading? 
In all greatness, nice to see someone driver design knowledgeable with the same spirit as me (efficient boost & buck drivers).
SK98, nice choice; pretty popular. I see you've managed to fit that into its short shelf. 
May sound a tad weird but, would it be more or less easy-feasible to turn it into a boost/buck engine for 2S input? I mean, compatible with 2S li-ion input for bigger torches, even if it means the driver has to grow a bit. 
Cheers ^:)
Buck drivers already exist (mtn electronics has one). The Boosting at high current is what makes this new driver interesting.
Can you change the boost voltage up to 12V
For driving xhp35 led
A buck driver cannot regulate an emitter over the full battery input voltage range if it falls below what the emitter needs plus overhead, The_Driver. Also, a boost + buck engine could be made with a wide output voltage range and, with a few board/programming changes, allow for the desired input voltage cutoff (2.75V, 5.6V, custom values for different chemistries, etc) for over-discharge protection. Sort of a high efficiency universal driver.
Cheers ^:)
Recently I saw a 20mm 3A boost driver for 6V leds on kaidomain
Looks promising to me!
Interesting find!
I’d still love to see the GXB20/17 come alive, especially when it comes with the possibility to use an electronic switch.
Quick update:
I put together a little setup to do a bit more testing and it looks like it's generally working. Also tested the low battery routines, modes, as well as over-temperature and it all seems to generally work out well!
For the record, this is with Firmware V0.8.
In addition, I had a friend who was making some PCBs so I tagged on a little on his order and got a small batch of 15 low-cost PCBs made:
I soldered up two of the boards as well as updated them with the newest firmware, and made them into a flashlight! I will be testing it in-real-life use for a while to see how it does but for now it does seem to be working as I had intended :)
Finally if anyone is interested in playing with these, I'm offering 10 bare PCBs for sale for a token $3 each. I'll be putting up a more detailed page together with schematics and BOM soon. It's tricky to put together because of the small components but I figured maybe some people here will be interested. Unfortunately I will not be able to offer assembled drivers at this time.
Thanks everyone for following so far! I'll be testing out the flashlight extensively In-The-Field with the GXB20 over the next few days!
Thank you for the update. Your skills and perseverance in seeing your project through to completion are amazing!
I couldn’t agree more.