Switching 12v and up to 3A from a microcontroller

Discussion in 'The Projects Forum' started by markmelive, Jan 14, 2013.

  1. markmelive

    Thread Starter Member

    Aug 13, 2012
    30
    0
    Hey Guys,

    I need to turn ON 12v load (up to 2A current) using a microcontroller. So when microcontroller port pin is at "HIGH" (5v), the 12v load should be turned ON. Like a switch, I thought of using NPN and PNP -transistor combination, but I have 12 output loads to be controlled using microcontroller, so 12x2 = 24 transistors is not feasible. As i have to make the circuit very compact like a usb drive. So any Suggestions, pls help....Any ICs which can do the job??
     
  2. markmelive

    Thread Starter Member

    Aug 13, 2012
    30
    0
    How about simple switch 5A step down voltage regulator LM2678????..
     
  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Your post doesn't make it absolutely clear, but if you have to control 12 different loads of up to 2A each, you will need a minimum of 12 driver circuits. I don't think there is any IC that will handle that. You can do it with 12 MOSFETs, each connected to a different load.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,135
    3,054
    Look for a MOSFET transistor array, such as AOP609.
     
  5. markmelive

    Thread Starter Member

    Aug 13, 2012
    30
    0
    It cannot be done with 1 transistor, As negative terminal of all loads are grounded together. So i cannot connect each load accross the transistor to control individually....Did u get it??
     
  6. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    As is often the case, we need to use the language of electronics. Post a schematic, please.
     
  7. wayneh

    Expert

    Sep 9, 2010
    12,135
    3,054
    Wanna bet? ;) If you've described it accurately it can. One transistor per load, that is.
     
Loading...