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

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.

The attiny25V is good for low voltage Applications, I found this on Aliexpress https://www.aliexpress.com/item/ATTINY25V-10SU-SOP8-ATTINY25V-10-SOP-ATTINY25V-SMD-2piece-lot-new-and-original/32793537074.html…
Attiny13 is good too and Much cheaper , the only Problem with it is the 1024 byte Flash.

Thanks Jensen567, you are almost certainly right.
If I could make it simpler, cheaper, higher output with a custom driver that would be great, but custom firmware is the place to start for sure.

I reflowed the driver, but it seems dead any test I can do?

when I turn it on a current of about 6mA flows

I tested all parts to have continuity to the other parts and it seems all right

I get 1.3V from ground to LED+
and 0.56V over the LED

read the TI datasheet is says that the power safe mode pin must not be open, it has 3 pads so I have to solder bridge one?