Choosing Power Supply Design/Type

[DanyO]

I'm currently trying to drive a large array of LEDs. (around 500). I feel comfortable with the rest of the design (array, constant current source), but I'm not too familiar with power supply part.

I've determined that my array will be dissipating roughly 35W of power. Here are the characteristics I'm looking for:

-Input will be mains (120V)
-Capable of supplying roughly 60-80watts.
-Output voltage can be anywhere from 20v to 60v
-Smaller the better

What type of power supply would best suit my needs here?

Do you guys have any standard/goto design that you would use in this type of application?

As an alternative to a design from scratch, do you know of any off the shelf parts (fairly priced) that can do the same?

 

[Genovator]

The best thing is to use a transformer of around 24V 3A. Its just one component to be attached directly with the mains. And if you want DC output, just 4 piece of diodes at output will do.

 

[mtwieg]

When you say an "array," do you mean all the LEDs will always be sharing current equally in some fixed parallel/series combo, or is this for some sort of display where groups of LEDS are controlled independently?

For a simple constant current source, you might find an off the shelf supply if you looked hard enough. But there are tons of app notes on designs available from companies like Linear Technology, Texas Instruments, Power Integrations, etc.

 

[bill66656]

At least, you need AC/DC to accept the 120 input, and you need to design your topology--Series, parallel or combinative. Series is not recommended, for the whole will break once only one fails.