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Power Supply For 12X Meanwell Ldd-700Hw Drivers


Dem

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I am about to purchase a power supply for my new LED project that will be running 12x Meanwell LDD-700HW drivers. If my calculations are right I need ~ 10A powersupply (12 x 0.7A = 8.4A).

My pick was Meanwell SP-480-48 (480W, 48V, 10A). Just want to make sure my choice is right. Thanks.

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Looks good to me, although they're expensive as all hell.

Yes, but the drivers are sooooo cheap, and with 12 of them he'll be saving a ton. I'm researching an led build and from what I can tell this seems to be the way to go.

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You're running ~144 leds? I prefer the one power supply approach.

 

If you're willing to trust knock offs direct from China, I just picked up a 500w (480w) 48v Mean Well knock off for $50 shipped within 7 days from aliexpress. Seller was Arlen&Alice. Another seller offered one for $42.

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Or just use two Meanwell S-350-48 and save $80-100.

 

Well I cannot find that here but I can get 2x Meanwell SP-320-48 for $20 less. I know they are more bulky and almost double the size but using these I will be able to run 8x LDDs per power supply (16 total) compared to 12x LDDs using a signle 480w. So if I ever need more power for LDD drivers i can hook up 4 more. What do you think? Any advantage of using a single power supply compared to dual?

Also I know that the 320W power supply is rated for 6.7A and 320W but I still can use even a single LDD driver running at 0.7A/36W? As far as I understand it the driver is pulling out whatever ma/w it needs and you do not have to attach max number of drivers in order to run properly?

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I ended up ordering 2x SP-320-48. As it is rated at 6.7A I can hook up around 8x LDD-700ma drivers or 16 total, compared to only 12 for the 480W version PS. Again, I want to make sure, even when the powersupply is rated at 6.7A, I can hook up only 1 LDD driver to it if I want so, right?

 

P.S.

I have a little concern about my choice. I now realize that I have to connect my controllers ground (DIM-) to the Vin- of each LDD and then to the ground terminal (-V) of the power supply. To elaborate this, each of the LDD Vin- wire splits into two, one goes to the DIM- terminal of the controller and the other goes to the ground terminal of the powersupply. Wouldn't that damage the power supplies as their grounds will be connected (both power supplies grounds will be connected to the same DIM- terminal of the controller)

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jedimasterben

I ended up ordering 2x SP-320-48. As it is rated at 6.7A I can hook up around 8x LDD-700ma drivers or 16 total, compared to only 12 for the 480W version PS. Again, I want to make sure, even when the powersupply is rated at 6.7A, I can hook up only 1 LDD driver to it if I want so, right?

 

P.S.

I have a little concern about my choice. I now realize that I have to connect my controllers ground (DIM-) to the Vin- of each LDD and then to the ground terminal (-V) of the power supply. To elaborate this, each of the LDD Vin- wire splits into two, one goes to the DIM- terminal of the controller and the other goes to the ground terminal of the powersupply. Wouldn't that damage the power supplies as their grounds will be connected (both power supplies grounds will be connected to the same DIM- terminal of the controller)

Yes, you can run only a single driver from the power supplies. They are constant voltage supplies, unlike constant current supplies like the drivers.

 

And the common ground on the power supplies is just that - a common ground, so you're fine to plug them in anywhere.

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