參數(shù)資料
型號(hào): INA117
元件分類: 差分放大器
英文描述: High Common-Mode Voltage DIFFERENCE AMPLIFIER
中文描述: 高共模電壓差分放大器
文件頁數(shù): 7/14頁
文件大小: 192K
代理商: INA117
7
INA117
MEASURING CURRENT
The INA117 can be used to measure a current by sensing the
voltage drop across a series resistor, R
S
. Figure 4 shows the
INA117 used to measure the supply currents of a device
under test. The circuit in Figure 5 measures the output
current of a power supply. If the power supply has a sense
connection, it can be connected to the output side of R
S
to
eliminate the voltage-drop error. Another common applica-
tion is current-to-voltage conversion as shown in Figure 6.
FIGURE 4. Measuring Supply Currents of Device Under
Test.
380k
380k
380k
21.1k
20k
4
7
2
3
8
1
5
V–
V+
V
2
V
3
V
O
= V
3
– V
2
6
200
10
10
If offset adjust is also required,
connect to offset circuit, Figure 2.
CMR
Adjust
FIGURE 3. CMR Trim Circuit.
FIGURE 5. Measuring Power Supply Output Current.
380k
20k
380k
380k
380k
380k
380k
21.1k
4
7
2
3
8
1
5
6
R
S
R
C
*
C
I
DUT+
I
DUT–
21.1k
20k
4
7
2
3
8
1
5
V–
V+
6
R
S
V–
V+
Device
Under
Test
–V
S
+V
S
*Not needed if R is less than 20 —see text.
(+200V max)
(–200V max)
V
O
= R
S
I
DUT+
V
O
= R
S
I
DUT–
R
C
*
380k
380k
380k
20k
21.1k
4
7
2
3
8
1
5
6
R
S
R
C
*
I
L
V–
V+
±200V max
Load
Power Supply
Out
Sense
*R
C
= R
S
not needed if R
S
is less than 20
—see text.
Optional Load
Sense Connection
(see text)
V
O
= I
L
R
S
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