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malaybiswas
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I am making a high intensity LED light panel for my aquarium. I got 15 1w Luxeon white LEDs rated at 350mA max continuous current and 3.42V forward voltage.
The LED driver I am planning to use is Xitanium LED-120A-0024V-10F. Here is a link to the datasheet. http://www.luxeonstar.com/xitanium-120v-drivers.pdf. Specification is
Input - 120 VAC 0.3A 31.9W
Output - 7.8-24.6 VDC 1050mA 25.5W
My basic circuit plan is to have 3 leg parallel circuit with each leg having 5 LEDs, so that I have 350mA current on each leg and need 17.1V for each leg of 5 LEDs.
The driver will be connected to power source with a timer to maintain a 10 hr photo period (or anything else that I want).
In this mix I would like to add a circuit that can control the intensity of the lights so that when timer is switched on intensity of lights gradually increase from 0-100% over 1-1.5 hrs time. Then they remain at full intensity till timer goes off. When timer goes off, the intensity decreases from 100-0% over 1-1.5 hrs time.
The ramp up and ramp down periods may not be exactly 1-1.5 hrs. I guess 30 mins can also work (just as long as it can be visibly noticed over a fairly long period of time)
I can do basic circuits, but my knowledge on devising advanced circuits is very limited.
Can anybody suggest me a circuit design to produce this effect for the specifications mentioned? I would prefer something that hopefully does not require too many IC components as I fear that I might riun them by in correctly choosing/connecting stuff. A simpler circuit which might not be as smooth will probably be the best bet for me to try.
Any help is greatly appreciated in advance
The LED driver I am planning to use is Xitanium LED-120A-0024V-10F. Here is a link to the datasheet. http://www.luxeonstar.com/xitanium-120v-drivers.pdf. Specification is
Input - 120 VAC 0.3A 31.9W
Output - 7.8-24.6 VDC 1050mA 25.5W
My basic circuit plan is to have 3 leg parallel circuit with each leg having 5 LEDs, so that I have 350mA current on each leg and need 17.1V for each leg of 5 LEDs.
The driver will be connected to power source with a timer to maintain a 10 hr photo period (or anything else that I want).
In this mix I would like to add a circuit that can control the intensity of the lights so that when timer is switched on intensity of lights gradually increase from 0-100% over 1-1.5 hrs time. Then they remain at full intensity till timer goes off. When timer goes off, the intensity decreases from 100-0% over 1-1.5 hrs time.
The ramp up and ramp down periods may not be exactly 1-1.5 hrs. I guess 30 mins can also work (just as long as it can be visibly noticed over a fairly long period of time)
I can do basic circuits, but my knowledge on devising advanced circuits is very limited.
Can anybody suggest me a circuit design to produce this effect for the specifications mentioned? I would prefer something that hopefully does not require too many IC components as I fear that I might riun them by in correctly choosing/connecting stuff. A simpler circuit which might not be as smooth will probably be the best bet for me to try.
Any help is greatly appreciated in advance