OPA188_15 Datasheet, PDF (21/34 Pages) Texas Instruments – Precision, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifiers

OPA188
www.ti.com
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.
15V
R₁
RR
RR
15V
OPA188
VOUT
R₁
VREF
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.
V
Load
I_LOAD
R_SHUNT
100m
15V
+
OPA188
V_OUT= I_LOAD*R_SHUNT(1+R_F/R_IN)
V_OUT
V_OUT / I_LOAD= 1V/49.75mA
R_IN
R_F
100
20k
C_F
150pF
Figure 46. Low-Side Current Monitor
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Product Folder Links: OPA188
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