ULN2605 Driving Higher Current LED Array

Discussion in 'The Projects Forum' started by Imager, Apr 10, 2012.

  1. Imager

    Thread Starter New Member

    Apr 10, 2012
    2
    0
    Looking at driving a custom LED sign, basically consisting of 12 letters with multiple LEDs making up each letter. Each letter will have a maximum of 18 LEDs, and with these connected up in parallel sets of three in series, each letter will draw approximately 120mA.

    Looking at driving this with a PIC16C63A. My question is.. Can I drive the inputs to the ULN2605 (DIP pins 3, 6, 11 and 14) directly from the PIC outputs?

    Tried reading over the technical notes on the ULN2605, but I am at a loss interpreting it.

    I would apply GND to the ULN2605 pins 4, 5, 12, 13 and +12v to pins 1 and 8.

    Appreciate any feedback and thoughts...
     
  2. Imager

    Thread Starter New Member

    Apr 10, 2012
    2
    0
    Updated: I had the wrong part number listed for the ULN chip - fixed..

    Looking at driving a custom LED sign, basically consisting of 12 letters with multiple LEDs making up each letter. Each letter will have a maximum of 18 LEDs, and with these connected up in parallel sets of three in series, each letter will draw approximately 120mA.

    Looking at driving this with a PIC16C63A. My question is.. Can I drive the inputs to the ULN2065 (DIP pins 3, 6, 11 and 14) directly from the PIC outputs?

    Tried reading over the technical notes on the ULN2065, but I am at a loss interpreting it.

    I would apply GND to the ULN2065 pins 4, 5, 12, 13 and +12v to pins 1 and 8.

    Appreciate any feedback and thoughts...
     
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,176
    397
    AT 100 % duty cycle, 120mA should be safe. Limit PIC output current with about 2.2k resistors to B.
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,176
    397
    Suggest closing this post as it has been re-posted with corrected information.
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Actually, I chose to merge them instead. Have fun.
     
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