Agilent Technologies Option H48 Multiport Test Set Z5623A User's And Service Manual page 121

The DUT may require a control voltage that is different from any of the
existing power supply voltages. Rather than adding another power
supply, a circuit such as the one shown in
derive the needed voltage from one of the existing power supply
outputs. The IC shown in the figure is a 3-Terminal Adjustable Voltage
Regulator (National Semiconductor Part No. LM317). It can supply a
maximum output current of 1.5 A provided that (V
The equations governing the circuit shown in Figure 4-13 are
The equations show that the circuit can be adjusted for any output
voltage (V
voltage of 15 V is used and (b) the values of R1 and R2 shown in
7-3
Figure 7-3 Adjustable Voltage Regulator Circuit
Power
Supply
Agilent Technologies Z5623A Option H48
3 V ≤ (V ) ≤ 40 V
- V
IN OUT
1.2 V ≤ V
OUT
V = (1.25 V)(1 + R
C 2
= 50 µA (typical)
I
ADJ
) from 1.2 V to 12.0 V provided that (a) a power supply
C
are used.
National Semiconductor
LM317
In
+
1 µF
V can be adjusted from +1.2 to +12.0 V if Power Supply = +15 V
C
Figure 7-3
/ R ) + I (R )
1 ADJ 2
Out
Adjust
= 215 Ω
R
1
R
2
Advanced Topics
Using the Control Lines Connector
can be used to
) ≤ 15 V.
- V
IN OUT
Figure
+
1 µF
= 2 kΩ
V
C
7 -9