LED drivers and Accessories you want, but don’t exist

There are certainly plenty of high powered Boost-Buck controllers out there, but many require 4 external MOSFETs which makes space a problem. Using some super small surface mount FETs it might be possible to build something in the 30mm range. LTC3780 comes to mind here.

I’m willing to bet the MP8632 would output beyond 13V by a bit, similar to how the TPS61088 will actually max out around 13.7V instead of 12.5 like the datasheet says. We do tend to operate a lot of things outside of specs here. Haha.

Yeah, those FET’s really eat up the space which would already be tight without them. Thats what makes these chips so attractive. Plus the lack of FET’s reduces the complexity which is always good for small designs.

Maybe I can get an ATTiny13A on the MP3431 board, for biscotti-HD. To control the IC I would use the method used in the H2-C.

How about ATTiny85 for e-switch?

Though either would be lovely…

The 85 isn’t available in a package small enough to fit the underside of the board, I need 3x3mm, even 4x4mm is too big.

Which parts list for this one
I need it fot 1.4A UV LED with 4.1V forward voltage in 17mm

OK, I thought you meant the usual SOIC-8. Anyway, there are many great uses. :+1: :slight_smile:
Though I think there are uses for 20+ mm variants with e-switch too. :slight_smile:


Forgot that, the inductor is 1.5uH.
But I haven’t tested the circuit myself, so I just can hope it works. I will check the pinout one more time. I can recommend some Opamps, but I need the input voltage range for that. To get 1.4A, your resistor R3 should be as close to 5932.2 Ω as possible. Less resistance for less current, more resistance for more current.

I too would like to build a UV light. Looking for a boost driver for 2x26650 to get 15V 1A to LED. Doesn’t need anything except on/off.

Input is a single cell 3.7V

this 20Mhz one OK?
http://www.mouser.de/ProductDetail/Texas-Instruments/OPA322AQDBVRQ1/?qs=sGAEpiMZZMuUbyQTl9BuV63CpDOSJaNbsqa6U%2FwQSlo%3D

Yes this OpAmp will do it. Due to the 2mV maximum offset the current could be between 1.3-1.5A.

If you only want on/off you can just use one of those buck converters from AliExpress.
I use one too for my 3*26650 light with a 100W COB in front.

Those better?
https://www.mouser.co.uk/ProductDetail/Texas-Instruments/OPA365AIDBVR/?qs=sGAEpiMZZMuUbyQTl9BuV5RTXIcMxZggHHJtoxXnn3c%3D

https://www.mouser.co.uk/ProductDetail/Microchip-Technology/MCP651ST-E-OT/?qs=sGAEpiMZZMuUbyQTl9BuVyNQLnF40q7dKQoRTha3NI8%3D

https://www.mouser.co.uk/ProductDetail/Microchip-Technology/MCP621ST-E-OT/?qs=sGAEpiMZZMuUbyQTl9BuVwXrcVct7erJvV%252bB4xpxNIA%3D

Take the OPA365, the microchip parts seem to have a really high input offset drift when the supply voltage changes.

could you share that board?

TPS63020 board link

Kinda crying out in the wilderness here, but I need a high discharge FET drive that will allow these five conditions simultaneously;

- always on momentary signaling switch,
-adjustable frequency and duty cycle strobe only,
-momentary only,

- adjustable thermal step down,

  • ability to lock out programmability with
    closed solder junction.

Sounds more like you need custom firmware instead of custom hardware. Any of the BLF FET drivers should support that hardware wise.

Can you Recommend a 17mm Driver (single cell) for xhp35 ?

I currently try to make one. PCB is nearly finished, but I need to find an ATTiny25v rev. E in qfn package. I maybe will order from different shops, maybe some have the revision E.