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#1 (permalink)      10/28/2013 5:26:19 AM US Central   quote/reply + tips
Airgunnut
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output voltage
what is the out put voltage in 2-lithium configuration? (is it suitable for Cree XM-L U3-1C 6000-6500K 1100-Lumen White LED Emitter on 20mm Star when used with 2 18650 battery's?)
#2 (permalink)      10/28/2013 7:03:58 AM US Central   quote/reply + tips
pilfer
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This is a constant current driver. The output voltage varies according to the voltage drop of the LED attached to it.
#3 (permalink)      10/28/2013 7:44:39 AM US Central   quote/reply + tips
Airgunnut
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so is that a yes?
#4 (permalink)      10/28/2013 9:00:03 AM US Central   quote/reply + tips
pilfer
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That's a yes. But 2.8A is driving it a bit too hard. I'm not sure but you might kill or severly shorten the lifespan Of the LED.
#5 (permalink)      10/28/2013 10:00:05 AM US Central   quote/reply + tips
Airgunnut
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just found the data sheet for the Cree XM-L U3-1C (thanks to freeze31 and his post on the led)it says the led can handle 2.9V @700mA
3.1V @1500mA
3.35V @3000mA
thanks for your help
#6 (permalink)      4/17/2016 11:29:44 AM US Central   quote/reply + tips
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Barkuti
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Airgunnut wrote:

so is that a yes?



To my knowledge, “yes” is not a voltage value.
Drivers are current controlled power supplies, they are designed to dynamically adjust their output's voltage by monitoring the voltage drop through a shunt resistor and comparing it to their reference voltage value (0'07V for this driver).
This driver, at stock configuration, uses a 25mΩ shunt resistor. Therefore (I = V / R):

Vout = 70mV / 25mΩ = 2.8A

Uugh! Went a tad off-topic…

To FastTech's staff: could someone grab a multimeter and test the driver's output voltage when fed at the input with 6 to 8'5 volts? I want to make sure this thing can drive XHPs.

Cheers


Edited on 5/11/2017 at 5:08 AM. Reason: