Determine the minimum value and the maximum value that the series resistor may have in a regulator circuit whose output voltage is to be 25 V, whose input voltage varies from 35 to 40 V, and whose...

Determine the minimum value and the maximum value
that the series resistor may have in a regulator


circuit whose output
voltage is to be 25 V, whose input

voltage varies from
35 to 40 V, and whose maximum

load current is 75 mA. The Zener diode used in
this

circuit has a
maximum current rating of 250 mA.

specifications:

V

z



=
12 V
r


z


=
11
.
5

P


rated



=
400 mW