3
3
4
4
V+
VR
REF200
100µA
INA139
INA139
R1
R2
VO
VO
1
1
RL
Gain Set by R1 R2
Gain Set by RL
Output Offset = (100µA)(RL)
(VR)R2
Output Offset =
(independent of V+)
R1 + R2
a) Using resistor divider.
b) Using current source.
FIGURE 4. Offsetting the Output Voltage.
±1A
1Ω
Charger
4
3
4
3
+
48V
+5V
Load
+5V
1kΩ
1kΩ
1kΩ
1kΩ
5
5
INA169
INA169
2
2
1
1
1N4148
Comparator
SIGN
1N4148
10kΩ
10kΩ
0V to 1V
VO
100kΩ
FIGURE 5. Bipolar Current Measurement.
INA139, INA169
7
SBOS181D
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