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The output voltage of the voltage regulator is constant at 18.5 V. Assuming the op-amp and Zener diode are ideal, the maximum power dissipated in the transistor is ______ mw. The transistor β is very high.
    Correct answer is between '11,12'. Can you explain this answer?
    Verified Answer
    The output voltage of the voltage regulator is constant at 18.5 V. Ass...

    Due to virtual short, the voltage at inverting terminal is Vz

    Then the current 
    ≃ 0.545 mA
    Since op-amp is ideal no current is drawn by it,
    ⇒ IC ≃ IE = I1
    VCE = (20 ~ 40) V – 18.5 V
    VCEmax = 21.5 V
    Power dissipated (maximum) = 21.5 × 0.545 mA
    ≃ 11.72 mW
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    The output voltage of the voltage regulator is constant at 18.5 V. Assuming the op-amp and Zener diode are ideal, the maximum power dissipated in the transistor is ______ mw. The transistor β is very high.Correct answer is between '11,12'. Can you explain this answer?
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