Timeline for TLC5940 with multiple voltage RGB LEDs
Current License: CC BY-SA 2.5
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 13, 2011 at 1:22 | comment | added | Rengers | Thanks, I think I get it now. Since my LEDs require 20mA current, I would need a 1.92k Ohm reference resistor (as stated in the datasheet). | |
| Mar 13, 2011 at 1:19 | vote | accept | Rengers | ||
| Mar 13, 2011 at 1:04 | comment | added | davidcary | The TLC5940 forces the correct current through the LEDs. As long as the correct current goes through the LEDs, the LEDs will set their own voltage -- there's nothing you can do about that voltage, even if you wanted to. | |
| Mar 12, 2011 at 20:25 | comment | added | W5VO | @Rengers All you need to do is make sure that you have enough voltage applied to the anode of the device so that your highest voltage LED will turn on. Looking at the datasheet, your anode voltage should be at least 3.6V. If you apply 20mA to your LED, then you will have your forward voltage drop - they are related. | |
| Mar 12, 2011 at 19:51 | comment | added | Rengers | Ah ok, that's neat! But do the three different colors need a different voltage (and can this be done), or am I misunderstanding the current/voltage relation? | |
| Mar 12, 2011 at 18:28 | history | answered | W5VO | CC BY-SA 2.5 |