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Need help figuring out PWM output through a Mosfet

Discussion in 'Power Electronics' started by dangerbird, Jan 11, 2021.

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  1. dangerbird

    dangerbird

    3
    0
    Aug 11, 2019
    Hi,

    I'm working on this car amplifier. The 3524 PWM chip out puts a square wave that goes to the gate of the P25N06 Mosfet. My square wave looks okay out of the PWM (although the Duty cycle is not what I expected) but the output from the Fet looks awful. I have the Fets disconnected from the transformer and each other when I test. When I breadboard the circuit the PWM output looks better, but I still get crappy output from the Fet. I've tried several different Fets and 3524 chips. What am I doing wrong?

    https://www.dropbox.com/preview/Driver Test Files/Amplifier files/AmpPwr.jpg?role=personal

    https://www.dropbox.com/preview/Driver Test Files/Amplifier files/Output of pin 14 and output of P25N06.jpg?role=personal


    [​IMG]
     
  2. Bluejets

    Bluejets

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    938
    Oct 5, 2014
    Best post your photos here.
    Don't think anyone wants to sign in to whatever site to view your input.
     
  3. dangerbird

    dangerbird

    3
    0
    Aug 11, 2019
    Sorry, wasn't thinking.
     

    Attached Files:

  4. Bluejets

    Bluejets

    4,424
    938
    Oct 5, 2014
    Not into power system inverters but i'd say the transformer would have an effect on the output as would the frequency level.
     
    Minder likes this.
  5. dangerbird

    dangerbird

    3
    0
    Aug 11, 2019
    You are probably correct. However, I have a shorted transformer, so I'll have to fix that first. Thank you for your help.
     
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