Amplify Current @ Output of PIC

Discussion in 'Embedded Systems and Microcontrollers' started by brummerman, Apr 28, 2009.

  1. brummerman

    Thread Starter New Member

    Apr 28, 2009
    1
    0
    I need to drive a device on the output of a PIC that has a rating of 5V, 1A. Currently, the output at the PIC is 5V, .5 microamps. What would be the best circuitry to use to do so. I was thinking a series of Darlington transistors. Thanks.


    brummerman
     
  2. shoka

    Active Member

    Mar 12, 2009
    39
    0
    u can use an IC called ULN2003, it's a darlington transistor array,
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    The maximum sink/source current for a pin of PIC is 25mA.

    You can use a logic level MOSFET to drive your load like IRL520.
     
  4. lightingman

    Senior Member

    Apr 19, 2007
    374
    22
    Failing that, Just use a MOSFET. I have just finished a project PWMing a motor using a MOSFET switching a 4 amp motor.
    If you use a MOSFET, you must put a pull-down resistor from the PIC output to ground so that the MOSFET gate is not floating when the output is in the hi Z state during boot-up.
    About 10K will do the trick.

    Daniel.
     
  5. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    Typically the transistor is used as a "low side switch" google it.
     
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