They are polarity sensitive- the extra diodes inside protect the LED's from damaging reverse voltages.
The package has 8 leads- all the connections are available so you can configure the drive any way you need.

An LM3414 for each color will be very efficient and relatively simple- each one can be controlled by a PWM input via the DIM input.

To drive two LED's- connect them in series.

The biggest challenge is mechanical- these beasts need proper SMD mounting with a significant heatsink.

Can I have a circuit diagram of how to put these together to make the LEDs work?
Thanks

 

I think a question that should be asked (sorry if I missed it), is what is the intended purpose? That can control how a circuit is designed to support the objective. If this is purely educational, then 3 transistors, appropriate resistors and a few other discrete components and/or logic gates could do all one needs.

 

Can I have a circuit diagram of how to put these together to make the LEDs work?

Do you have a preference for driving the LEDs (high side vs low side)?

If you drive low side, you can use a logic level N channel MOSFET. If you want to drive high side, you can't drive a P channel MOSFET directly with a 5V control signal.

Low side driving is straightforward.

For high side driving, you'd have to do something like this:

Times 4; one for each color.
You could use bipolar transistors, but you'd need to do calculations for current.

Dissipating heat in the LEDs is going to be an issue.

 

I think a question that should be asked (sorry if I missed it), is what is the intended purpose? That can control how a circuit is designed to support the objective. If this is purely educational, then 3 transistors, appropriate resistors and a few other discrete components and/or logic gates could do all one needs.

It's just for educational purpose. Is there a circuit diagram that I can use as a reference.

 

It's just for educational purpose. Is there a circuit diagram that I can use as a reference.

Information was given in post #23. Is there something you don't understand?

 

Information was given in post #23. Is there something you don't understand?

Do I connect the 5V on and 0V off to the Arduino? And is there any transistor that you recommend me using? What’s the value for R1?

Thanks

 

You guys are trying to make this difficult and it is not. It is a simple exercise for the Uno ramping PWM up and down on 3 pins that I have done before. Since I suspect this is a school assignment I will leave it at that. Typically done with one RGB but easily doubled in or out of sync.

 

Cree® XLamp® XM-L® Color LED

Is there any particular reason for using this LED instead of the standard RGB LED?

 

Is there any particular reason for using this LED instead of the standard RGB LED?

No, I just managed to find this. Are there other LEDs that you recommend?

 

You guys are trying to make this difficult and it is not. It is a simple exercise for the Uno ramping PWM up and down on 3 pins that I have done before. Since I suspect this is a school assignment I will leave it at that. Typically done with one RGB but easily doubled in or out of sync.

Can you show me a picture of how you connect them together?
thanks

 

Do you have a preference for driving the LEDs (high side vs low side)?

If you drive low side, you can use a logic level N channel MOSFET. If you want to drive high side, you can't drive a P channel MOSFET directly with a 5V control signal.

Low side driving is straightforward.

For high side driving, you'd have to do something like this:
View attachment 182040
Times 4; one for each color.
You could use bipolar transistors, but you'd need to do calculations for current.

Dissipating heat in the LEDs is going to be an issue.

One for each colour means I need 8 circuits for 2 LEDs?

 

These are what are typically used and will not require switching transistors and can be driven by the Arduino directly. Note that these are common anode and you want common cathode.

https://www.aliexpress.com/item/32423998570.html?spm=a2g0o.productlist.0.0.451f56e6gOm1QK&algo_pvid=ae16977e-7f13-4dac-ac55-cf2786016a9f&algo_expid=ae16977e-7f13-4dac-ac55-cf2786016a9f-2&btsid=1ade4b92-159e-4658-a368-fbfd8f08bd34&ws_ab_test=searchweb0_0,searchweb201602_4,searchweb201603_52

It will require 3 pins, one for each color or 6 if you drive each LED separately.

 

One for each colour means I need 8 circuits for 2 LEDs?

Since you want both RGBW LEDs to have the same color and brightness, you only need 4 drivers. One for each color.

 

Since you want both RGBW LEDs to have the same color and brightness, you only need 4 drivers. One for each color.

Doesnt matter if I have 2 LEDs, right?

 

Doesnt matter if I have 2 LEDs, right?

You're going to have the LEDs, each with their own current limiting resistor, in parallel.

 

You do realize that those are surface mount 4 color LEDs? and not the standard through-hole RGB 5mm LEDs?

 

You do realize that those are surface mount 4 color LEDs? and not the standard through-hole RGB 5mm LEDs?

What are the problems with surface mount LEDs?

 

What are you going to mount them on?

 

What are the problems with surface mount LEDs?

In your case, the main problem will be dissipating heat. 350mA through all 4 will dissipate around 3W. Read the datasheet to find out what the junction temperature will be without adequate heat sinking.

 

In your case, the main problem will be dissipating heat. 350mA through all 4 will dissipate around 3W. Read the datasheet to find out what the junction temperature will be without adequate heat sinking.

So can i mount it on a heat sink?