This is a buck mode (step down) LED driver for series strings of 1W LEDs with a wide 12 to 42v input voltage range.
The best number of LEDs is 3, input 12-42v will give you about 300mA through them.
I have tested briefly from 1 to 9 leds and it operates fine, however with more than 3 the current achieved starts to drop-off (9 leds was about 200mA at 42v input) and with less than 3 the current below 20v input is a bit low.
Absolute maximum input voltage is 42v, operation below 12v not recommended.
The input voltage should be higher than about 4 times the number of leds, or 12v whichever is greater (eg for 5 leds, you should give it 20v)
THIS IS NOT A MAINS POWER DEVICE but you can also supply AC 12-30v (eg from an MR16 lighting type supply).
Input and output are solder pads, solder wires to them. Inputs are marked "V", these are not polarised connect positive and negative either way around. Outputs are marked LED+ and LED-, these are polarised of course.
I have no idea what the driver IC is on this one, some random chinese device I suppose.
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