dimming control for LED lighting

Community PCB Design
1

if anyone has the PCB design for dimming control on LED, which must adjust the current not voltage.

2

pmacpeter:
if anyone has the PCB design for dimming control on LED, which must adjust the current not voltage.

Can you provide more details of your need?

Hint:

Physical size of PCB required

Number and type of LEDs

Range of current adjustment required

Connection of LEDs (series or parallel)

Number of LEDs in a series chain

Type of supply voltage (AC/DC low voltage, house current)

Number of channels

Type of user control(s)

Are willing to cover the cost of circuit design, PCB design,

PCB fabrication, and shipping?

3

The PCB will be 2.5 x 2.5 inches.

The LED will be 1 Watt to 100 Watt, if there is limitation on wattage, like must be above 10 Watt, etc.

The range of current adjustment will depend on the total max power

It would be in series connection.

The number of LEDs in a series chain will depend on total max power

The input is 100 to 250V AC

The number of channels will depend on the total max power

Type of user control(s) will be local touch and/or wireless RF

Yes we do

4

100 watt LED?

Hell, a 10 watt lightbulb can cause eye damage, are you trying to signal god? Message other planets?

5

I’m developing similar circuit right now. Couple things are different though. First, given 3.7V forward voltage, 100W single string of 1W LEDs would have (surprise!) 370V on it’s ends. If you go with 3W LEDs it would be 120V, which is not that bad but still. Usually for this kind of power you want like 3 strings on separate controllers, this way if one LED dies you’ll still have some light. Second, current adjustment is a bad idea - LED spectrum depends on current, white LED, for example, would look rather blue powered by low current. The right way to control LED intensity is PWM. There is plenty of PWM LED controllers, I prefer ones from Linear Tech.

6

Shifted:
100 watt LED?

FYI, you can get 100W LEDS…

Here’s one made by Edison Opto: http://www.edison-opto.com.tw/products_ … =1&cno=253

They cost a little bit tho… :wink:

7

This is not a single LED, it’s a string. Look at rated Vf, it’s 33V:-).

8

I know, i didn’t say it was a single die product…

Nevermind.

9

pmacpeter:
The range of current adjustment will depend on the total max power

The number of LEDs in a series chain will depend on total max power

The number of channels will depend on the total max power

You are not ready to engineer a product with such sloppy

specs. Are you serious? Are you willing to put ten grand

(USD) on the table to work on your POC prototype?