The datasheet of TI TLC5944 LED driver (http://www.kynix.com/uploadfiles/pdf8827/TLC5944PWP.pdf) says "constant current sinking" capability is 60-mA.(LED Power supply voltage up to 15 Volts, and Vcc=3.0V to 5.5 V )
My understanding is if Sink current is low, then its better as it will not heat-up my LED driver chips.
1- I want to understand What is the importance of High (or Low) LED driver Sink current?
2- Why we do not talk about sourcing Current instead?