Q5:a) In the regulator circuit of Figure ,Determine Rext if the maximum internal regulatorcurrent is to be 250 mA.b) Using a 7824 voltage regulator and a 10 2 load, how much power will the externalpass transistor have to dissipate? The maximum internal regulator current is set at500 mA by Rext-c) Show how to include current limiting in the circuit of Figure . What should the valueof the limiting resistor be if the external current is to be limited to 2 A?d) Using an LM317, design a circuit that will provide a constant current of 500 mA to aload.xext15 VoRext7809OVOUTFigure

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Answered: a) In the regulator circuit of Figure ,…

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a) In the regulator circuit of Figure , Determine Rext if the maximum internal regulator current is to be 250 mA.

Introductory Circuit Analysis (13th Edition)

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Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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Question

Q5:
a) In the regulator circuit of Figure ,Determine Rext if the maximum internal regulator
current is to be 250 mA.
b) Using a 7824 voltage regulator and a 10 2 load, how much power will the external
pass transistor have to dissipate? The maximum internal regulator current is set at
500 mA by Rext-
c) Show how to include current limiting in the circuit of Figure . What should the value
of the limiting resistor be if the external current is to be limited to 2 A?
d) Using an LM317, design a circuit that will provide a constant current of 500 mA to a
load.
xext
15 Vo
Rext
7809
OVOUT
Figure

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