Hi,
I want to control 10W RGB LED with Arduino UNO R3 PWM pins. Can you suggest me how should I connect this.
LED LINK: 10W RGB LED
LED Specifications:
Forward Voltage: Red (6-7v), Green(9-12v), Blue(9-12v)
DC Forward Current : 300mA
Output Power: 10W
Light Color: RGB
Wavelength: Red(620-625nm), Green(520-525nm), Blue(460-465nm)
Lumens: Red(300-400lm), Green(600-700lm), Blue(300-400lm)
View angle: 120 Degree
Use resistors or (preferably) a constant current regulator. If the regulator has a pwm dimming pin, use that, otherwise switch thw low side using an n-channel mosfet with logic level gate.
If i were doing it id probably use amc7140 or amc7135 (with the zener diode trick to keep vcc in spec - this works beautifully) linear constant current regulators. If efficiency was a big concern, id use a switching regulator instead, but these are harder to work with
The Arduino can't directly drive it. The Arduino outputs are 5V at 40mA or less. The actual current depends on the load ([u]Ohm's Law[/u]).
Look for a 300mA constant-current driver (or power supply) rated for 10W or more. (You'll need 3 of them.)
[u]LED drivers & power supplies[/u]
It's possible to use regular power supply and a current-limiting resistor (like with a regular-little LEDs), with a MOSFET for switching (including PWM). But that's not really "proper" and it's inefficient because the resistor often dissipates more power than the LED. There are online LED-resistor calculators if you don't know how to do it, but make sure to calculate resistor power and get a high-power resistor to handle the wattage.
Also, high power LEDs need a heatsink.
Thanks for your suggestions. I am beginner so I don't know much. I found this module will it work?
Link: High Power MOSFET Trigger Module
That spec page is very confusing for that item. I don't need constant output... I have a reliable 24v power supply.. what I need is to be able to control something from 0-24v fed by PWM trigger of 3.3v (DUE). I could supply it with 24V and just accept that I'd never fully achieve 24V out.. Actually, I need to control 3 of something... each consumes 3A at full 24V (72W). So I have a 10A capable 24V DC power supply. I'm wondering if 3 of the modules you mentioned would be satisfactory....
From the device inscriptions it seems that module uses AOB4184 logic-level MOSFETs (40V, 13 milliohm)
which seems reasonable.