+ Post New Thread
Results 1 to 5 of 5
  1. #1
    Member level 1
    Points: 1,612, Level: 9
    Achievements:
    7 years registered

    Join Date
    May 2008
    Posts
    36
    Helped
    0 / 0
    Points
    1,612
    Level
    9

    white led circuit

    Hellow.
    I need to have an exilent circuit to drive white LED from 6V or 12V battery. Application can be varried from one LED to 100 LEDs.
    Please help.


    Regards
    Vicky

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 3
    Points: 13,776, Level: 28

    Join Date
    Feb 2002
    Posts
    749
    Helped
    103 / 103
    Points
    13,776
    Level
    28

    led drive circuit

    Add a resistor in series with each LED being connected to the battery.



    •   AltAdvertisement

        
       

  3. #3
    Full Member level 1
    Points: 2,111, Level: 10
    cougar168's Avatar
    Join Date
    May 2005
    Location
    Silicon Valley => Shanghai
    Posts
    113
    Helped
    11 / 11
    Points
    2,111
    Level
    10

    white led driver circuit

    Quote Originally Posted by vicky.pace
    Hellow.
    I need to have an exilent circuit to drive white LED from 6V or 12V battery. Application can be varried from one LED to 100 LEDs.
    Please help.


    Regards
    Vicky
    What is your LED rating?



    •   AltAdvertisement

        
       

  4. #4
    Banned
    Points: 8,487, Level: 22
    Achievements:
    7 years registered

    Join Date
    Jun 2008
    Posts
    1,180
    Helped
    37 / 37
    Points
    8,487
    Level
    22

    white led circuits

    you have many leds...so best you put in series and regualte the current in the string using a led driver...

    you can use boost led driver......surt on linear.com etc etc and others for led drivers....or you can make one yourse;lf out of a uc3845 uc3842.

    its just a @current catcher"...current gets to threshold ..turn off

    all the led drivers on web are SMD...if you want thru hole you have to use say uc3845 like i say.

    you must drive leds current mode.......must

    it too inefficent to do voltage mode....you done want ANY resistor s in series......you r batt muss be preserved



  5. #5
    Member level 4
    Points: 2,187, Level: 10

    Join Date
    Nov 2004
    Posts
    69
    Helped
    2 / 2
    Points
    2,187
    Level
    10

    led driver circuit

    Take a look at:
    http://hmin.tripod.com/als/fsmyth/pages/drivers1.html

    There are a few example drivers.



--[[ ]]--