Help with MOSFET driver circuit

Discussion in 'General Electronics Chat' started by bk8190, May 12, 2010.

  1. bk8190

    Thread Starter New Member

    May 12, 2010
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    0
    I'm trying to drive an IRF530 power MOSFET from a 5V arduino output. I'm using the transistor to momentarily switch a load connected to a car battery (12V). My problem is that the IRF530 requires at least 7V to fully "turn on," and the arduino's 5V is too low.

    How would I go about making a driver circuit from the 12V power supply and the arduino's 5V output? I have several PNP and NPN small-signal transistors and resistors to work with.

    Thanks for the help,
    bk8190
     
  2. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    Easiest to just replace it with a logic level MOSFET. There are plenty about that have the same or greater specs than the IRF530
     
  3. bk8190

    Thread Starter New Member

    May 12, 2010
    4
    0
    I know that would be easier, but unfortunately the IRF530's are the only power transistors available to me
     
  4. bk8190

    Thread Starter New Member

    May 12, 2010
    4
    0
    Never mind, I figured out how to do it. I use an NPN transistor in a common emitter configuration. The base is connected to the arduino through a 3k resistor. The collector is connected to the MOSFET gate and +12V through a large resistor (1M). The emitter is grounded.
     
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