Protection:Reverse polarity protection, low voltage protection, mode memory function
Suitable for the LED of type voltage 2.8-4V
Measurements
Single mode buck driver
Tested with Cree XP-G2 led
Diameter: 17mm
Thickness: 6mm
This driver is a buck chip (AX2002) with surrounding components, there is no microprocessor or other stuff on the board. This makes it very easy to change led current, in the datasheet for the AX2002 chip there is a resistance table with values from 20mA and up to 1.5A led current. On the board the resistor is just beside the black wire.
High
The driver has stable output from about 4 volt and up with around 80% efficiency.
The driver starts at around 3.4 volt and because there is no low voltage warnings or anything it works exactly the same with increasing voltage as with decreasing voltage.
There is no noise in the output.
Conclusion
This is a simple driver for people that do not want modes, but just light.
Yeah I figured that would be a weak point. My boards came with the SS14, but I’ve already ordered some SS34’s. The diodes were on ebay for cheap, but I can’t find anywhere else to get the resistors. Shipping from Mouser is a bit much for a $0.12 part
Very interesting little driver, not alot of output but still a good buck driver…all the sites I have seen say max input is 16vdc, even though the chip says 23vdc is max, all the components used to drive the buck circuit might not go that high w/o letting out the magic smoke
That could fit the bill for you also; after all, driving current seems somewhat above 1A for an R250. If not, use "R300 resistor" as search terms, that'll do the job. ;-)
Old news I know but stack higher value resistors to get a higher wattage rating(I.e. two 0805 .6’s to get 1/4W .3 ohm). There’s a chance that 1206’s will fit since one end is toward board edge.
Also, the Fastech 4-pack 925 mA buck driver is not an AX2002 but instead This QX9920 which has a max rating of 2.5A. It can also be pwm controlled. Might be a good choice for a new project.
