Lume1-FW3X: Constant Current Buck-Boost & FET Driver with Anduril1/2 + RGB Aux

[jarhart]

@thefreeman

True moonlight levels would be great.

+1

Lower than the stock driver if possible.

[loneoceans]

@jarhart

@thefreeman

True moonlight levels would be great.

+1 Lower than the stock driver if possible.

Something is in the works..

[Chatika_vas_Paus]

@loneoceans

Change 3A Buck-Boost to… 5 or 6A Buck? (limited by Z-height of driver cavity)? Perhaps most people would like a little more power, though I guess 3A is sufficient since thermal handling of this flashlight is likely limited to ~2 to 4W at thermal steady state.

But why? 3A is quite fine for this flashlight. The Ti version doesn’t pull any more. It seems to me steps backwards. I understand everyone wants a lot of power in a small package, but it doesn’t make sense if it’s only available for a few seconds. In this case, less = better. I hope that I am not the only one who thinks so and it will not be changed.
Plus, it works great with the 219B.

[KevinZA1988]

@Chatika vas Paus

@loneoceans

Change 3A Buck-Boost to… 5 or 6A Buck? (limited by Z-height of driver cavity)? Perhaps most people would like a little more power, though I guess 3A is sufficient since thermal handling of this flashlight is likely limited to ~2 to 4W at thermal steady state.

But why? 3A is quite fine for this flashlight. The Ti version doesn’t pull any more. It seems to me steps backwards. I understand everyone wants a lot of power in a small package, but it doesn’t make sense if it’s only available for a few seconds. In this case, less = better. I hope that I am not the only one who thinks so and it will not be changed.
Plus, it works great with the 219B.

I agree. 3A constant current means an already hot flashlight, especially with specific LED’s. I would much rather have a way to limit or manage turbo current for longer turbo runs. If it could be user adjustable to suit specific LED setups or turbo runtime management it would be fantastic.

[contactcr]

Unpopular opinion: with 6A i say get rid of the FET entirely and make that Turbo. Add more quality of life features with board space.

[KevinZA1988]

@contactcr

Unpopular opinion: with 6A i say get rid of the FET entirely and make that Turbo. Add more quality of life features with board space.

Hmmmm…

[Mark_M]

@contactcr

Unpopular opinion: with 6A i say get rid of the FET entirely and make that Turbo. Add more quality of life features with board space.

This is the way.

[id30209]

This is the way...

[Agro]

There was some talk months ago about making a regular 21 mm driver based on lume1 design.
Any news about it?

[thefreeman]

This one can be filed down to 21mm and an e-switch pad will be added in the next version.

[maba]

I have it!

[clientequator]

@maba

I have it!

It is a very nice picture! What do you think of performance of lume1 compare with orignal driver?

Is the left image a emisar D4? The driver look different from original, is it a special driver?

[Agro]

Out of curiosity, would it be possible to modify this driver to work with 6V LEDs?

[thefreeman]

@Agro

Out of curiosity, would it be possible to modify this driver to work with 6V LEDs?

Vout max of TPS63020 is 5.5V.

[id30209]

@thefreeman

@Agro

Out of curiosity, would it be possible to modify this driver to work with 6V LEDs?

Vout max of TPS63020 is 5.5V.

Hmmm...

[thefreeman]

It’s the buck-boost IC that this driver uses, hence it cannot drive 6V LEDs.

[Agro]

Would it be reasonably possible to replace TPS63020 with something similar that would offer higher output range? F.e. I don’t know if it would be any good but I see TPS552882-Q1 that is only 2mm² larger and offers much higher in/out voltage range. As well as much higher currents.

[thefreeman]

It’s less integrated, requires a few more passive and 2 external N channel mosfet for the buck leg, for example a dual N channel 3.3x3.3mm mosfet.

Last time I looked at this IC I tried using Webench and it doens’t want to design the circuit with 1S li-ion voltage so maybe I missed something in the datasheet.

[Agro]

I see, thanks for your input.

[Quadrupel]

LumeX1 will cover all boost driver needs. That new TI boost IC is really nice