Datasheet

11
®
INA145
FIGURE 7. Current Monitor, G = 1.
FIGURE 8. Comparator Output with Optional Hysteresis Application to Sense Lamp Burn-Out.
FIGURE 9. AC Coupling (DC Restoration). FIGURE 10. Precision Current Source.
V
O
V
O1
18
6
R
G1
11kΩ
R
C
10Ω
R
S
10Ω
R
G2
100kΩ
INA145
5
2
Power
Supply
Load
3
For sense resistors (R
S
)
greater than 5Ω, use
series compensation
resistor (R
C
) for good
common-mode rejection.
Sense resistors greater
than 200Ω are not
recommended.
G = 10
V
O
1V – 50mV
+5V
148
6
8.4kΩ
INA145
57
Feedback
2
3
10MΩ
8kΩ
10kΩ
1V
2kΩ
Lamp
24V
SHUNT
R-I Lamp/10
e.g., 0.1Ω for 1A
V
O
18
6
R
G1
11kΩ
R
G2
100kΩ
R
1
1MΩ
INA145
OPA277
5
2
3
C
1
0.1µF
V
IN
–
V
IN
+
Pole at
f = = 1.6Hz
1
2πR
1
R
C
V
O
I
OUT
= (V
IN
– V
IN
)/10kΩ
1
8
6
R
G2
10kΩ
10kΩ
INA145
5
2
3
V
IN
–+
V
IN
+
–