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Unformatted text preview:  4. (a) Describe what is meant by avalanche breakdown .  (b) In the analysis of the Zener shunt regulator circuit, the Zener diode is considered to be source of emf in series with a dynamic resistance. Explain, with the aid of a diagram, how this is consistent with the I – V characteristic of the diode.  (c) The resistor R in a Zener shunt regulator circuit is chosen to be 200 Ω . The output voltage is 5.3 V when the diode current is 15 mA and the supply voltage is 10.1 V . The output voltage changes to 5.2 V whilst the diode current is 5 mA for a supply voltage of 9.8 V . Determine: (i) the output voltage when the diode current is zero (ii) the dynamic resistance r (iii) the current through R and the load current when the output voltage is 5.3 V (iv) the load regulation ...
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- Spring '11