Datasheet
OPA188
15V
R
IN
R
F
R
SHUNT
Load
I
LOAD
V
V
OUT
100m
V
OUT
= I
LOAD
*R
SHUNT
(1+R
F
/R
IN
)
V
OUT
/ I
LOAD
= 1V/49.75mA
100 20k
+
C
F
150pF
OPA188
+
15V
15V
V
OUT
R
R
1
R
R
R
V
REF
R
1
OPA188
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SBOS642A –MARCH 2013–REVISED MARCH 2013
Figure 45 shows the basic configuration for a bridge amplifier. Click the following link to download the TINA-TI
file: Bridge Amplifier Circuit.
Figure 45. Bridge Amplifier
Figure 46 shows the OPA188 configured in a low-side current-sensing application. The load current (I
LOAD
)
creates a voltage drop across the shunt resistor (R
SHUNT
). This voltage is amplified by the OPA188, with a gain of
201. The load current is set from 0 A to 500 mA, which corresponds to an output voltage range from 0 V to 10 V.
The output range can be adjusted by changing the shunt resistor or gain of the configuration. Click the following
link to download the TINA-TI file: Current-Sensing Circuit.
Figure 46. Low-Side Current Monitor
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