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LED driver


kkyip
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V is the supply voltage.
Vf is the LED forward voltage drop found on the datasheet.
I is the forard current - it must be high enough to give reasonable light output but bellow the maximum value listed on the datasheet.

In this example:

I = 10.4mA
Vf = 1.9V
V = 9V

Now you can check that I've used the correct resistor if you want.

post-0-14279142173047_thumb.png

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V is the supply voltage.
Vf is the LED forward voltage drop found on the datasheet.
I is the forard current - it must be high enough to give reasonable light output but bellow the maximum value listed on the datasheet.


I dont think thats what hes asking. What hes saying is why use a LED driver chip.

Main reason is to have constant current output to a bunch of LEDs.


Most of it explained here:

http://www.siliconchip.com.au/cms/A_100966/article.html
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