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OPA388-Q1 Datasheet(PDF) 20 Page - Texas Instruments

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No. de pieza OPA388-Q1
Descripción Electrónicos  OPA388-Q1 Automotive, Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail, Input/Output Operational Amplifier
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To set the gain of the difference amplifier, the common-mode range and output swing of the OPA388-Q1 must be
considered. Equation 3 and Equation 4 depict the typical common-mode range and maximum output swing,
respectively, of the OPA388-Q1 given a 3.3-V supply.
–100 mV < VCM < 3.4 V
(3)
100 mV < VOUT < 3.2 V
(4)
The gain of the difference amplifier can now be calculated as shown in Equation 5.
Gain
=
Diff_Amp
V
V
= 15.5
V
V
R
(I
I
)
OUT_Max
OUT_Min
SHUNT
MAX
MIN
-
-
´
3.2 V
100 mV
100 m
-
W ´
- -
[1 A
( 1A)]
=
(5)
The resistor value selected for R1 and R3 was 1 kΩ. 15.4 kΩ was selected for R2 and R4 because this number is
the nearest standard value. Therefore, the ideal gain of the difference amplifier is 15.4 V/V.
The gain error of the circuit primarily depends on R1 through R4. As a result of this dependence, 0.1% resistors
were selected. This configuration reduces the likelihood that the design requires a two-point calibration. A simple
one-point calibration, if desired, removes the offset errors introduced by the 0.5% resistors.
8.2.3 Application Curve
1.65
-1.0
-0.5
0
0.5
1.0
0
3.30
Input Current (A)
Figure 8-2. Bidirectional Current-Sensing Circuit Performance: Output Voltage vs Input Current
OPA388-Q1
SBOS989 – AUGUST 2020
www.ti.com
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