How about ATTiny85 for e-switch?
Though either would be lovely…
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:
Though I think there are uses for 20+ mm variants with e-switch too.
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
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?
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,
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?