SparkFun Forums

[Systembolaget]

I want to drive high-quality Citizen, Bridgelux or Lumileds LEDs. They require 34-36V forward voltage, depending on model.

The SparkFun Femto Buck looks like it could work https://www.sparkfun.com/products/13716 but what step-up module would I need to use LiIon batteries, because these only deliver 3.7V, so the voltage needs to be boosted.

Thanks for any hints on what to buy!

[Valen]

A dc-dc step-up converter that outputs 36 volt maximum from an input as low as 3 volt. The femtobuck is a current regulated stepdown converter so it's input needs to be higher than it's output. Incidentally 36 volt is also the maximum input voltage to the Femtobuck.

[Systembolaget]

Alright, so the Femto Buck is out and I need to find a small Arduino-compatible step-up driver that will boost the 3,7V to 36V. Can't find anything like it at Sparkfun or Pimoroni, etc. What do you guys use to power high-quality LEDs from the major brands? They're always between 34V and 36V.

[DanV]

Doesn't quite go to 36VDC but will do 30VDC:
https://www.pololu.com/product/2571

[Systembolaget]

Ok, that's too bad. Maybe that's why there is no good portable LED luminaire out there yet, all of them being gimmicks with hardly any lumen output or an Ra above 90...