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We appreciate your patience as we improve our online experience.
01-11-2011 08:11 AM
Dear all,
I would like to design a rectangular pulse generator width adjustable pulse width in LV to build a stroboscope for a power LED.
Are you aware of simple hardware diagrams or devices that could convert the low current output from a PC connected DAQ device to drive a high power LED with a power consumption in the 1-3 Amps range? (Note, the LED is run with constant voltage, brightness is controlled by current).
Many thanks for consideration
Holger
01-11-2011 08:17 AM
It sounds like all you need is a switch. Select a power MOSFET with a current rating of 5-10 A, a voltage rating greater than the power supply voltage to the LED and a gate threshold voltage low enough that it turns on fully with the logic level output from your DAQ digital output.
Lynn
01-11-2011 09:20 AM
Thanks Lynn, I am not an electronic expert but are you saying that
many thanks for your help
Holger
01-11-2011 09:25 AM
Yes that circuit would work. The resistor from the gate to ground assures that the transistor stays non-conducting if the LED power supply is one and the DAQ device is not.
I do not have a part number to recommend off the top of my head and I have some work of my own to do now so I cannot look something up for you. I may have some time later in the day.
Lynn
01-11-2011 10:03 AM
Thanks Lynn, I found a "logic level" FET IRLU 024N with a DS capability >10A - that'll do 🙂
Many thanks indeed for your help.
Holger