Need help on DC/DC buck converter

Discussion in 'The Projects Forum' started by apis87, Jun 22, 2009.

  1. apis87

    Thread Starter New Member

    Jun 22, 2009
    2
    0
    Hi, I am new with electronics, I am studying electronics at my college. Currently I am building a buck converter to convert 12V input to produce 10V at the output. The figure that I have uploaded is the input PWM signal (labeled 1) and the switching signal for the buck converter. My question is, are the PWM signal supposed to be the same with the switching signal for the buck converter? and can anyone give any suggestions on how I can improve the design of my circuit to obtain a better square wave shape. I am building the switching circuit for the buck converter using 2 BJT’s.




    • Oscilloscope settings : 5.00V/division, 25.0us/division
    • Ch1: mean voltage = 4.32V, frequency 15.38khz
    • Ch2: mean voltage = 9.38V, frequency = 204.1khz
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Post your circuit.

    Your fall time looks good, but your rise time isn't so good.

    Please don't use the custom fonts; it makes posts much harder to read.
     
  3. apis87

    Thread Starter New Member

    Jun 22, 2009
    2
    0
    sorry for the font, here is the circuit diagram. I welcome any advice on how I can get a batter shape for my waveform. Thank you very much.
     
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