50 Watt LED Wired To DC/DC Converter

Hello, I want to wire a 50 watt led to run off of 12 volts.                                                                                                                                   here is info on components:                                                                                                                                                                                    50 watt led                                                                                                                                                                                                           forward voltage:30-36 Vdc                                                                                                                                                                                  forward current: 1750-3000mA                                                                                                                                                                                                                            DC/DC converter:                                                                                                                                                                                                  input volts: 12DC                                                                                                                                                                                                      output volts: 48DC                                                                                                                                                                                              output current:3A                                                                                                                                                                                                Can I use resistors to make this work?                                                    

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flatfish (author) 3 years ago

Thank you, Pitty

pitty3 years ago

Don't know if you are still after this but this is what you will be looking at:


50 watt resistors are expensive but you can get them and they will work but I would go with an adjustable regulator set for 30 to 36 volts and wired for high current. I can give you a schematic you can tweak to your needs.

flatfish (author)  Josehf Murchison3 years ago

thanks josehf, I had this converter laying around and was hoping to put it to simple use. looks like that's not gonna happen. guess it'll lay around a little longer.

You can still use it.

I have 3 and 5 amp adjustable voltage regulators in my parts stock.

However not the one you need at 50 volts input and adjustable volts 3 amps output.

The circuit is the same as a LM317 adjustable voltage regulator if you want to look it up on line.

flatfish (author)  Josehf Murchison3 years ago

Thank you, Joshf. It would cost more than it is worth to me to do that.

I use this converter to power my 100W LED boat light.

It is a 600W DC/ DC constant current converter. 12V in to 35V out

I run the 100W LED at 35V forward voltage and 2800mA forward current.

I have it in a waterproof box.

The 48V converter is waterproof, so it would work well on a boat, but if I have add something else that is not waterproof it defeats my purpose.

Thank you for your knowledge.

Converter  600W.jpg

I think that DC to DC converter can be adjusted.

See the two blue square things with a screw on top they are pots and they may set the output voltage.

A better look at both sides or the datasheet with a schematic would help.

flatfish (author)  Josehf Murchison3 years ago
yes, one pot adjusts the voltage and the other adjusts current.
I use this with a 100W LED. it puts out a super bright light.

It should run the 50 watt also when adjusted right.

First of all the LED is at the max of that DC to DC converter can give you so if you don't have the right resistor in there it will blow the converter. Secondly it will take a pretty hefty resistor with heat sync to pull that off. Third what are you planing to power this with. The DC to DC converter will need at the very least 12A to give you 48V @ up to 3A. That's if it's 100% efficient, which nothing is. So it may require 15A to 20A.

Find and buy a driver that is designed for a 50W LED.
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