Problems about this LED Driver Sink Current

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The datasheet of TI TLC5944 LED driver ( 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?

Can anyone answer me the questions?


It would be more appropriate to direct your questions to Texas Instruments.