Results 1 to 5 of 5

Thread: ULN2803 and stepper

  1. #1

    Default ULN2803 and stepper

    when I drive 2 stepper motor .. with ULn2803 ... with sequence

    11001100 --- > 1st sequence
    01100110
    ..................
    ...............


    Then every time 4 pins 0f ULN is getting activated ... that means the current through each pin is 500/4 or 125 mA ... ? and when the sequence is

    10001000 ----- > 2nd sequence
    01000100
    ....................
    .................

    then the current through pin is 250 mA ...

    I have stepper motor of 12V 500mA ... which one will be the best ....

    Or shall I use ULN2003 for each motor .. then using sequence 1 which will give 250 mA to each motor .... or sequence 2 which will give 500mA to each motor ...

    What will be the solution to get the maximum torque and speed ...

    I dont want to use L297 + L298 ... .. I have some budget problem ...
    and L297 is not available here .. Kolkata ..

  2. #2
    Member Android
    Join Date
    Oct 2007
    Location
    Mumbai
    Posts
    89

    Default

    ULN 2803 contain eight Darlington transistor and each Darlington load current Capacity of 500mA
    So u can use ULN 2803 for 12 v 500mA stepper motor
    U can use ULN 2803 in pairs for extra current capacity

    read the datasheet of ULN 2803

  3. #3
    Senior Member Android
    Join Date
    Jan 2008
    Location
    KGP
    Posts
    104

    Default

    ULN2803 has current rating of 500mA per pin. So It should happily drive ur stepper. Remember, when you give "1" as inuput, o/p is "0", it operates in current sink mode.

  4. #4

    Default

    thanks to both of you

  5. #5
    Senior Member Cyborg
    Join Date
    Jun 2005
    Location
    India
    Posts
    298
    Blog Entries
    1

    Default

    u can use 8 relay card http://onlinetps.com/shop/index.php?...roducts_id=470
    it can drive upto 10Amp per channel also l293d http://onlinetps.com/shop/index.php?...roducts_id=497 or u can also use BD139 http://onlinetps.com/shop/index.php?...roducts_id=338 it can delevr 4 Amp small in size
    http://www.onlinetps.com/
    Online Component Shoppe
    Microcontrollers and Solar Robotics Stuffs at cheap rates

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •