X9119
Applications information
Basic Configurations of Electronic Potentiometers
+V
R
V
R
RW
I
THREE TERMINAL POTENTIOMETER;
VARIABLE VOLTAGE DIVIDER
TWO TERMINAL VARIABLE RESISTOR;
VARIABLE CURRENT
Application Circuits
NONINVERTING AMPLIFIER
VOLTAGE REGULATOR
V
+
–
S
V
V
V (REG)
O
317
O
IN
R
1
R
2
I
ADJ
R
R
1
2
V
= (1+R /R )V
V
(REG) = 1.25V (1+R /R )+I
R
adj 2
O
2
1
S
O
2
1
OFFSET VOLTAGE ADJUSTMENT
COMPARATOR WITH HYSTERESIS
R
R
2
1
V
–
+
S
V
V
S
O
100kΩ
–
+
V
O
TL072
R
R
1
2
10kΩ
10kΩ
V
= {R /(R +R )} V (max)
1 1 2 O
UL
RL = {R /(R +R )} V (min)
10kΩ
L
1
1
2
O
+12V
-12V
FN8162.4
July 9, 2008
15