Jump to content
Electronics-Lab.com Community

LED driver


kkyip

Recommended Posts


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

Link to comment
Share on other sites


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
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
  • Create New...