5V LEDs 5050 issue

Hi, I am wondering,

I have a 24V supply and I have 5V 5050 LEDs. I’m pretty sure you it will burn the LEDs out so what can I do for them to work. Do i use a 12V transformer?

Thank you

Personally I would use a DC-DC converter. There are loads advertised at very low cost on ebay, Banggood, etc. Obviously make sure it will handle at least 24V input (select something higher, to give a bit of headroom) and enough current for the LEDs.

You can put the leds in parallel and use a DC-DC step down converter that gives 5V output and accepts 24V input.
Or you can put 4 leds in series and whatever number of 4-led strings in parallel and use a 24V-20V step down converter.
Or if you insist on using a 24V-12V DC-DC converter you can make strings of 2 leds series connected each and put however many you want in parallel.

Thank you for replying fast!!
Is there another way instead of putting the leds in parallel?

Thank you for responding!!

So there isn’t another way without putting them in parallel or using a step down converter?

How many LEDs do you have? Are these actually LED strips we're talking about, individual LEDS (then they wouldn't be rated for '5V'!!) or modules with one LED per module?
Can you link me to a product page and/or datasheet for your LEDs?

Possibly, yes, but the above information is critical for a good answer.

€ 3,95 36% Off | Wifi 5050 RGB Led Strip Light USB Led Luces Tape Diode Ribbon Bluetooth-compatible Adapter For Room Desktop TV Backlight Kitch

I got them for €15 and I bought them because I though they were 12V

Ok, you need a step down DC-DC converter for those. There's no other way. These strips need to be powered with 5V.

Okay and how do you connect them to a dc dc step down converter please?

€ 0,54 11% Off | LM2596s DC-DC step-down power supply module 3A adjustable step-down module LM2596 voltage regulator 24V 12V 5V 3V

Would this be good?

The convertor has two terminals marked "IN", and two more marked "OUT". (Or something very similar.)

For the input pair, one of the terminals will be marked '+' or '+ve' or 'VIn', or something like that. The other will be marked '0V' or 'GND', or maybe '-ve'.

The output pair will be similarly marked, although the positive terminal may be marked 'Vcc' or 'Vout'.

So, connect the 24V DC supply to the terminals marked 'IN', making sure the positive lead goes to '+', '+ve' or 'VIn', and the negative lead goes to '0V' or 'GND'.

The output terminals (marked 'OUT') will then provide 5V for your LEDs. Obviously the positive terminal will be the one marked '+', '+ve', 'Vout' or 'Vcc', and the negative terminal will be marked 'GND' or '0V' or maybe '0V'.

It's much simpler than it sounds. 24V DC to the input pair of terminals, and you get 5V DC on the output pair.

Input + & - is where the output of your 12 /24V power supply goes.
Output + & - is where the led strips connect to.

Only for up to about 3 meters of led strips. You need to have one with a higher power rating for longer strips. The strips are specified to be 4W per meter, which at 5V is 0.8A. So for e.g. 5 meters worth of strips, you need 4A of power. That means you need a DC DC converter with AT LEAST a current rating of 5A (always factor in a safety margin; 20% as in this case is the bare minimum).

You may be better/easier off with a 5V switching power supply that you can simply plug into your wall outlet.
Something like this: AC DC 12V 5V 6V 8V 9V 10V 12V 13V 14V 15V 24V Power Supply Adapter 1A 2A 3A 5A 6A 8A 220V To 12V Power Supply Adapter LED Driver|Switching Power Supply| - AliExpress
You may need to cut the plug on the output to solder it (or otherwise connect it) to the led strips.

The leds are 10m.

So calculate the current using the formula I provided and you know what the current output of your power supply needs to be.

So for 10 meters of LED strips I need 8A of power

Well done! Then factor in a safety margin, and I'd say pick a supply that can source at the very least 10A. I gave you a link to one of several you may be able to find on your favorite shopping platform :wink:

Thank you so much! So it needs to be 5V and 10A?

That should work for your 10m led strips, yes!

Omg thank you so much you saved my life. Not only did you help me but made me understand a bit of physics.

That's great :slight_smile:

1 Like