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OPA2191 Datasheet(PDF) 32 Page - Texas Instruments

Part # OPA2191
Description  OPAx191 36-V, Low-Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp
PDF  65 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

OPA2191 Datasheet(HTML) 32 Page - Texas Instruments

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9.2.1.2 Detailed Design Procedure
The transfer function of the circuit in Figure 9-1 is given in Equation 2
OUT
LOAD
SHUNT
V
I
R
Gain
u
u
(2)
The load current (ILOAD) produces a voltage drop across the shunt resistor (RSHUNT). The load current is set
from 0 A to 1 A. To keep the shunt voltage below 100 mV at maximum load current, the largest shunt resistor is
defined using Equation 3.
_
_
SHUNT
MAX
SHUNT
LOAD
MAX
V
100mV
R
100m
I
1A
:
(3)
Using Equation 3, RSHUNT is calculated to be 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is
amplified by the OPA191 to produce an output voltage of 0 V to 4.9 V. The gain needed by the OPA191 to
produce the necessary output voltage is calculated using Equation 4:
_
_
_
_
OUT
MAX
OUT
MIN
IN
MAX
IN
MIN
V
V
Gain
V
V
(4)
Using Equation 4, the required gain is calculated to be 49 V/V, which is set with resistors RF and RG. Equation 5
is used to size the resistors, RF and RG, to set the gain of the OPA191 to 49 V/V.
F
G
R
Gain
1
R
(5)
Choosing RF as 360 kΩ, RG is calculated to be 7.5 kΩ. RF and RG were chosen as 360 kΩ and 7.5 kΩ because
they are standard value resistors that create a 49:1 ratio. Other resistors that create a 49:1 ratio can also be
used. Figure 2 shows the measured transfer function of the circuit shown in Figure 9-1.
9.2.1.3 Application Curves
ILOAD (A)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
1
2
3
4
5
Figure 9-2. Low-Side, Current-Sense, Transfer
Function
ILOAD (A)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.02
0.04
0.06
0.08
0.1
Figure 9-3. Low-Side, Current-Sense, Full-Scale
Error
OPA191, OPA2191, OPA4191
SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021
www.ti.com
32
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: OPA191 OPA2191 OPA4191



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