2 phase and single phase PWM

Discussion in 'Homework Help' started by fantabulous68, May 20, 2010.

  1. fantabulous68

    Thread Starter Active Member

    Nov 3, 2007
    51
    4
    The 1st part of the question 2a) requires the design of a triangle wave generator.

    So i need to get values for the capacitor and the 2 resistors (see circuit)
    Am I designing them correctly???


    R3
    R3=5V/0.1mA=50K

    C1
    C1=T/R3 f=50KHz phase thus T=1/f=20uS


    C1=20uS/50K=400pF


    R1 & R2
    The current in R1 and R2 must be the same

    Voltage of pwm output / R1 = current = Voltage at input / R2

    5V/R1 = 10V/R2

    so R1=10K and R2 = 20 K and current is 500uA
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
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