# Question 22.12: What is the load current in Fig. 22-21? What is the output r...

What is the load current in Fig. 22-21? What is the output ripple?

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Question: 22.17

## What does the circuit of Fig. 22-35 do? ...

The circuit of Fig. 22-35 is a solar LED lamp appl...
Question: 22.15

## n the buck regulator of Fig. 22-29, R1 = 2.21 kΩ and R2 = 2.8 kΩ. What is the output voltage? What is the minimum input voltage that can be used with the output voltage? ...

With Eq. (22-24), we can calculate: V_{out}...
Question: 22.16

## In the buck-boost regulator of Fig. 22-32, R1 = 1 kΩ and R2 = 5.79 kΩ. What is the output voltage? ...

With Eq. (22-24), we can calculate: V_{out}...
Question: 22.14

## The LM7805 can regulate to specifications with an input voltage between 7.5 and 20 V. What is the maximum efficiency? What is the minimum efficiency? ...

The LM7805 produces an output of 5 V. With Eq. (22...
Question: 22.13

## If R1 = 2 kΩ and R2 = 22 kΩ in Fig. 22-20, what is the output voltage? If R2 is increased to 46 kΩ, what is the output voltage? ...

With Eq. (22-19): V_{out}\cong \frac{R_1+R_...
Question: 22.11

## In Fig. 22-16, Vin can vary from 17.5 to 22.5 V. What is the maximum zener current? What are the minimum and maximum regulated output voltages? If the regulated output voltage is 12.5 V, what is the load resistance where current limiting starts? What is the approximate shorted-load current? ...

The maximum zener current occurs when the input vo...
Question: 22.10

## When the series regulator of Fig. 22-15 is built and tested, the following values are measured: VNL = 10.16 V, VFL = 10.15 V, VHL = 10.16 V, and VLL = 10.07 V. What is the load regulation? What is the line regulation? ...

Load regulation =\frac{10.16 \ V - 10.15 \ ...
Question: 22.9

## What is the approximate output voltage in Fig. 22-15? Why is a Darlington transistor used? ...

With the equations of Fig. 22-9: V_{out} = ...
Question: 22.8

## What is the approximate efficiency in Example 22-7? ...

With the equations of Fig. 22-8: V_{out} =\...