for driving LED, what is sourc sinc?

[Hesam Kamalan]

hi,
for driving LED, what is sourc sinc?

 

[qratman]

Do you mean what's the difference between sourcing and sinking or something else??

 

[Hesam Kamalan]

yes, thanks. guide me please.

 

[justDIY]

you source current from the high side and sink current to the low side ... typically sinking current, or low side switching, is more efficient, since you can use N channel switches, n-bjt or n-fet. so, knowning this, most led gizmos have the anodes of the leds connected to the postive rail (most likely through a resistor) and then sink current with a low side switch.

 

[patan_mustafa]

this figure helps you
**broken link removed**

 

[Hesam Kamalan]

this figure helps you
**broken link removed**

Thanks in advance