The LDD-1000 has a wide input voltage of 9-56v DC and a corresponding output voltage of 2 – 52v DC so you can size the Power Supply to suit you requirements – the supply needs to also meet the power (wattage) and current (amps) requirements of your led strings.Wow is right Scuba Rich they are bloody tiny!
I like the sound of the 1000mA drivers.
If the drivers handle 1 - 14 LEDs, how many drivers will the power supply handle MagicJ?
The ELN 60-48P which we are familiar with, operates at 48v DC, 60 watts and up to 1.3 amps (variable).
For this discussion, I will assume that a typical led will run at 1amp; have a forward voltage of 3.5 volts and thus require 3.5 watts.
Normally, the supplied voltage will be the limiting factor to the number of led’s that can be run in a serial string i.e. 48 / 3.5 = 13.7 rounded down to 13 led’s to allow some overhead for the supply.
In this example the total power requirement = 13 x 3.5w = 45.5 watts which is well below the rated 60w for this driver.
So, using the LDD driver the equation is pretty much the same – to drive 13 led’s at 1 amp you will require a Power Supply rated at 48v, 45.5 watts and 1 amp. But, to run 5 LDD’s it will need to be rated at 48v, 228 watts and 5 amps – a suitable supply might be the Meanwell SP 240W, 48v, 5.0a supply from here http://www.power-supplies-australia.com.au/single-enclosed-psu/sp-240.
But, you might want to only run 6 led’s per driver i.e. around 22v, 21 watts and 1 amp – for 5 you will want 22v, 105w and 5 amps – something like this http://www.power-supplies-australia.com.au/single-enclosed-psu/s-150.
One final example using the Meanwell SP-750-48 (48V / 15.7A) :
This will effectively drive 15 of the 1amp HDD drivers, with each driver hooked up to a string of 13 leds i.e. a total of 195 leds.
It is just a matter of working out your requirements and matching a Power Supply to fit.
One thing to note is that the price of the supply will increase as the wattage increases, and whilst the HDD series will accept up to 56v DC, the 48V supply seems to be the most cost effective option.
I will discuss the cost effectiveness of these drivers in the next post.