Controlling a DC motor with a MOSFET


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  1. #1

    Default Controlling a DC motor with a MOSFET

    Hello Guys,

    I know this may sound easy and silly, but I'm a software guy. I'm having some problems trying to control (on/off) a DC motor (7.2 volts @ 10A continuos) with a PIC.

    MOSFETs don't work with 5 volts on the Gate, right? I think that's my problem. I found this schematic on the Internet, will this work?



    Is it possible to control the MOSFET directly from the PIC?

    Thanks!

    Daniel.

  2. #2
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    If the gate saturation voltage is 5 volt or less then you can use the output from a PIC to "trigger" a MOSFET.

    Get rid of R2 and Q2. R1 should go to GND. A high from the PIC turns ON and when the PIC is not high, R1 turns the MOSFET off.

    Check the 510 data sheet. 10 amps might be pushing it.
    Dave
    Always wear safety glasses while programming.

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