*** Problem somewhat solved but please read the last post for new problem ***
Ok, I am looking for an alternative to the TLC5940NT but instead of it sinking current, I want it to source current. The reason would be because I have common cathode RGB LEDs. If there is no alternative, what else could I do to wire my RGB leds to the TLC5940NTs? Would I need to have some sort of transister/s to do that or is there something more simpler that I am not getting?
This is just a prototype that I am building with 16 common cathode LEDs. There are 3 TLC5940s connected in series, each one is responsible for a color (R-G-B). For each anode representing a color on the LED, goes to its respective TLC5940. For example, LED 1 has an anode for red, is connected to pin 28 on the 1st TLC5940, the anode for green is connected to pin 28 on the 2nd TLC5940 and the anode for blue is connected to pin 28 on the 3rd TLC5940. The same goes for every LED but is assigned to different pins on each TLC5940. There is a sanguino that is connected to the TLC5940's which will control the LEDs.
Because the LED driver sinks current on the output pins, the above mentioned circuit would not work. So between the anodes of the LEDs and the pins of the drivers (TLC5940) what can I do to keep the same setup?
Thanks for your help. I will make a schematic and post it up if needed.
Ok, I am looking for an alternative to the TLC5940NT but instead of it sinking current, I want it to source current. The reason would be because I have common cathode RGB LEDs. If there is no alternative, what else could I do to wire my RGB leds to the TLC5940NTs? Would I need to have some sort of transister/s to do that or is there something more simpler that I am not getting?
This is just a prototype that I am building with 16 common cathode LEDs. There are 3 TLC5940s connected in series, each one is responsible for a color (R-G-B). For each anode representing a color on the LED, goes to its respective TLC5940. For example, LED 1 has an anode for red, is connected to pin 28 on the 1st TLC5940, the anode for green is connected to pin 28 on the 2nd TLC5940 and the anode for blue is connected to pin 28 on the 3rd TLC5940. The same goes for every LED but is assigned to different pins on each TLC5940. There is a sanguino that is connected to the TLC5940's which will control the LEDs.
Because the LED driver sinks current on the output pins, the above mentioned circuit would not work. So between the anodes of the LEDs and the pins of the drivers (TLC5940) what can I do to keep the same setup?
Thanks for your help. I will make a schematic and post it up if needed.
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