Results 1 to 4 of 4

Thread: Why common anode?

Hybrid View

  1. #1
    Join Date
    Dec 2011
    Location
    Joliet, IL
    Posts
    202
    Post Thanks / Like

    Default Why common anode?

    I have searched, but can't find the answer.... Why use common Anode and not Cathode on RGB led's?
    Conventional thought (to me) is - is common, + is switched.

  2. #2
    Join Date
    Oct 2008
    Location
    San Jose, CA
    Posts
    8,950
    Post Thanks / Like

    Default Re: Why common anode?

    Many drivers have better sinking capability than sourcing (more mA/pin) so that would be at least one reason. Most, if not all of the boards here use switched grounds so you need common Anode devices.
    Brian

    Christmas in San Jose! - WEB - FB - VIDEOS
    Halloween in San Jose! - FB
    2014 Halloween Show - Homemade tombstones, Grave Crawler, 2x 3-axis skulls, 4x 1-axis skulls, Video Projection (more)
    2014 Christmas Show - 5x E681-12, 3x Ren48LSD, 32x42 TLS3001 pixel MT/Star, 4x Rainbow Floods, 12x DIYC Floods, SuperPixelStar, PixaBulb House outline

    Ignorance is Temporary - Stupidity is Forever...

  3. #3
    Join Date
    Nov 2009
    Location
    Brisbane - Australia
    Posts
    817
    Post Thanks / Like

    Default Re: Why common anode?

    Switching the ground makes interfacing the drive transistor to the micro-controller extremely easy.

    Also, NPN bipolar and N-channel FETs have always been more available and cheaper (for same spec) than their PNP and P-channel counterparts.
    David...

    Visit [URL="http://www.da-share.com/"]da-Share[/URL], the new home of da_DMX and da_E131.

  4. #4
    Join Date
    Dec 2009
    Location
    Villa Park, IL
    Posts
    110
    Post Thanks / Like

    Default Re: Why common anode?

    I thought it was because it's easier to control the source voltage.

Bookmarks

Posting Permissions

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