I'm planning to drive multiple RGB LEDs using a TLC5940 with PWM. These LEDs have the following specs:
Voltage Red: 1.8V
Voltage Green: 3.0V
Voltage Blue: 3.3V
Current per color: 20mA
Since the TLC5940 is a current sink, how would I make sure each led gets the correct voltage. Hook up a resistor between each cathode and the TLC5940?
Please forgive me for asking such a simple question, I'm still learning :).