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Topic: LED control question (Read 601 times) previous topic - next topic

CrossRoads

Sep 18, 2015, 07:01 am Last Edit: Sep 18, 2015, 07:03 am by CrossRoads
These LEDs
http://www.amazon.com/gp/product/B00MTE9V8C?psc=1&redirect=true&ref_=oh_aui_detailpage_o07_s00

DC Forward Voltage (VF): Red: 2.0-2.5Vdc, Green: 3.2-3.6Vdc, Blue: 3.2-3.6Vdc, DC Forward Current (IF): Red: 400MA/ Green: 350MA/ Blue: 350MA
Luminous Intensity: Red: 45-50LM, Green: 65-75LM, Blue: 20-25LM Wave Length: Red: 620-625nm, Green: 520-530nm, Blue: 460-465nm


If the current is limited to under the rated current, say 1/3 to 1/2,

can a resistor & N-channel MOSFET be used to drive them on/off?
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

borland

#1
Sep 18, 2015, 09:37 pm Last Edit: Sep 18, 2015, 09:40 pm by borland
Sure, but consider the power dissipation of the resistor for your 3W LED.   Might want to consider this MOSFET circuit..

Transistor - MOSFET Constant Current Driver


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