Need Help with Meanwell LDD DC-DC Drivers and their Power Supply

Buddhafamily456

Buddhafamily456

Member
So for The light I am building I would like to use a controller, which leads me into using the LDD Drivers so things are able to be controlled..

What I’m not understanding is
1) Say I chose an AC/DC power source that has an output of 36 Volts, and I want to control 5 different strings of LEDS, each string having an LDD DC/DC Driver being powered by my 36v DC source... if i’m using one (well actually 2 because I would need a spot for the 5th LDD Driver) of those LDD-4-H or LDD-4-HS boards would each LDD Driver be receiving 36v and splitting the voltage?
- Basically do the LDD-4-H or LDD-4-HS boards have your LDD Drivers in parallel or series coming out of the power source?

2) Also if there is only 1 output slot on the AC/DC power source is it best to connect the 2 LDD-4-H or LDD-4-HS boards in parallel pigtailing off to the one output spot on the AC/DC power supply?
Or is there another board with 5 slots for Meanwell LDD Drivers?

3) also, on the rapidled website it says that there is a 2-3v power loss from the AC/DC power supply. Does that mean that each LED String with Meanwell LDD Driver is actually getting 33-34v, not the actually 36v that the AC/DC Power Supply is saying it is giving?
- so in that case, if you had 12 monochromatic LEDs rated for 3 volts wired in series for 36v total in that string it wouldn’t work and you’d have to accommodate for the 2-3v loss and actually only have 11 leds at 3v for 33v (11 LEDS x 3v in series) a string? Or can you still factor it for the 36v?
 
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Randomblame

Randomblame

Well-Known Member
The HLG driver will run all the LDD's in parallel. These boards are internal wired in parallel, only plug and play, no soldering. Connect the HLG drivers dc output to the boards main input connector, plug the LDD's into each slot and connect the pwm dimming wires coming out of the controller to each LDD's pwm connections on the board.
In short, thats it.

Each LDD converts the constant input voltage into constant current to the cost of a few volts(up-to 96%). This means when 36v goes in you can use up to 33-34v but with constant current flowing thru the LED string.
Get the datasheet for these LDD's and the how-to of these boards.(pdf's)
For 10 and more white diodes you should take the HS version with higher input voltage. (52v)
You just have to make sure that the LDD's do not overload the driver as there is a certain loss. Leave about 20w of headroom, then you are on the safe side.

I wonder why you do not use one single thread for your questions? After all, we are still talking about the same lamp?!
It would certainly be easier if you had all the information in a thread.
 
Buddhafamily456

Buddhafamily456

Member
Awesome thank you so much, you really are a lot of help.

You’re right it would be a lot easier on one thread, I am just new to the forums so I guess that’s just part of the learning curve
 
nfhiggs

nfhiggs

Well-Known Member
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