I am trying to build an LED matrix (64x32) of RGB LEDs using a TLC5940 current sink LED driver.
The forward voltages of the LED components for each RGB LED are:
- R: 1.8V
- G: 2.8V
- B: 2.8V
The driver maintains a specified current which helps because I can supply 3.3V to all LEDs. This however means the TLC5940 has to dissipate the extra power.
Can I provide the R and GB components with 1.8V / 2.8V respectively (regulated down with a more efficient switching circuit) and still have it go to the constant current source driver? In other words, can the supply voltages to the R and GB components be different if they are being sunk into the same current source?