Consider the voltage-regulator circuit shown in Fig P4.52

Chapter 4, Problem 4.53

(choose chapter or problem)

Consider the voltage-regulator circuit shown in Fig P4.52 under the condition that a load current IL is drawn from the output terminal. (a) If the value of IL is sufficiently small that the corresponding change in regulator output voltage VO is small enough to justify using the diode small-signal model, show thatThis quantity is known as the load regulation and is usually expressed in mV/mA. (b) If the value of R is selected such that at no load the voltage across the diode is 0.7 V and the diode current is ID, show that the expression derived in (a) becomesSelect the lowest possible value for ID that results in a load regulation 5 mV/mA. If V+ is nominally 10 V, what valueof R is required? Also, specify the diode required in terms of its IS. (c) Generalize the expression derived in (b) for the case of m diodes connected in series and R adjusted to obtain VO = 0.7m V at no load.

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