Feedback of flyback (with TL431)

Discussion in 'General Electronics Chat' started by pini200, Apr 14, 2016.

  1. pini200

    Thread Starter New Member

    Feb 15, 2016
    14
    0
    How I should choose a capacitor and resistor in Feedback control
    (like Fc,Fpole,fzoro)
    i choose r3=38k,r5=10k rbais(r2)=1.2k
    vcc=12v,Cvcc=470uF
    What selection criteria capacitor and resistor (c2 r4 )
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,018
    3,235
    You can't choose those values without knowing the response characteristics of the rest of the feedback loop.
     
  3. pini200

    Thread Starter New Member

    Feb 15, 2016
    14
    0
    like what?
    (i forget add N=1:10.FS=60Khz,chip viper37LD)
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,018
    3,235
    I mean what does the rest of the circuit look like? A feedback loop is just that, a loop.
    You are only showing part of the loop.
     
  5. pini200

    Thread Starter New Member

    Feb 15, 2016
    14
    0
    add all of the circuit
     
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