over-current Protection

Discussion in 'Homework Help' started by mrkbuddy, May 17, 2013.

  1. mrkbuddy

    Thread Starter New Member

    Oct 3, 2012
    6
    0
    Please help me out to calculate the values of R1 & R2. what is the formula or how to derive it. i am attaching the circuit design. thanks

    Design task:
    Target specification for Current Limiting circuit
    (i) Io [max allowed current] = 2A
    (ii) Isc [fold back current] = 0.5A
    (iii) Regulated output voltage Vo = 12V

    d. Calculate the value of Rs.
    Io = 2A
    VbeM = 0.6A

    From Ohm’s Law
    Rs = VbeM¬¬ / Io
    Rs = 0.6 / 2
    Rs = 0.3Ω

    e. Calculate the values of R1 & R2 to achieve the above data?

    [​IMG]
     
  2. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
    Page 11, table 7
     
    mrkbuddy likes this.
  3. mrkbuddy

    Thread Starter New Member

    Oct 3, 2012
    6
    0
    thanks alot #12. :)
     
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