Lumintop GT nano on the way

[Agro]

@djozz

@Agro

I wonder why is it so hard? Did they try to make it a boost driver?

I have a few 10mm FET drivers from Mtn, 10mm is really small, he used really small components to make it fit and there is no way that a normal size 7135 can be added to make it FET+7135, I’m not surprised that it is a puzzle to make this driver.

A good solution IMO will be to omit the 7135 and make it a basic FET driver. The 7135 on theGT-mini and Micro drivers is to make the low modes more efficient because then you do not need PWM-ing the inefficient direct drive current. But the direct drive current in 10440 flashlights is not extremely high anyway so efficiency is not bad to begin with. So there is no need for a 7135 in this battery size and I’m sure that without it a fitting driver can be made by Lumintop. Hint!

Actually there are a couple of 10 mm FET+1 drivers available:

[WIP] 10mm DD+single-7135 driver: double sided 10440 torture for Dual-PWM

I’d consider this build to be very advanced. It will certainly require reflow soldering, maybe require touchup, and almost certainly require filing of components. Fortunately the PCBs cost very little - order one to cry over if you would like. I do not think that this design can be done in a significantly better way. B+ strap required. You’ll have a diode and C1 on the bottom of the board, so the strap will go diagonally between them. 0.5mm of exposed copper on the GND rings IIRC. The 7135 is…

DARKSIDE | NYMPH (10440 twisty Fet+1 flashlight w/ 4k 9050 219C)

The NYMPH is Darkside’s first product offering… [redacted] It’s a compact 10440 twisty with a Fet+1 driver, a Nichia 4k 9050 219C LED, and an integrated grade 5 titanium pocket clip. The light features what I am calling a “sinusoidal knurl” pattern: [image] [image] [image] [image] [image] [image] The 10mm driver is a single sided ATtiny13a based fet+1 called the “DS-10DD+1” and is basically an evolution of the MTN-10DD by RMM. I’ve ditched the OTC, using mem decay for offtime instead, ad…

The first one is certainly not something that I would recommend for production. The latter uses a 3x3 mm MCU; there is no Andruil-capable MCU of this size yet (though maybe one day someone will port it to Attiny1616…).
So neither is a direct hit.
FET-only is much easier though and that’s what I would expect from this driver.
You mentioned MTN-10DD. I studied the design lately and I really like it. I intend to build one this year. It is not a direct hit either - because it also uses a 3x3 mm MCU.
But it uses 3.3x3.3 mm MOSFET as well. Shrinking the FET to 2x2 mm should allow 4x4 mm MCU. It would increase resistance but it would still be perfectly adequate for 10440.