
FIXED INTEGRATED CIRCUIT VOLTAGE REGULATORS 63
Where V
z
is the nominal zener voltage.
A further improvement can be obtained by replacing the transistor with
an operational amplifier comparator, as shown in Figure 3.24. Almost any
Figure 3.24 Series voltage
regulator based on an
operational amplifier comparator
ΒΖΥ88 C6V2
(
1
A maximum)
Ο
OOV
Figure 3.25 Adjustable and
current-limited voltage regulator
9.3 V minimum to 18.6 V maximum
(600 mA maximum)
OOV
bipolar, BIFET, or JFET operational amplifier can be used in this
arrangement provided the input voltage does not exceed the maximum
rated supply voltage. The regulation of the arrangement show ...