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OPA191 Datasheet(PDF) 32 Page - Texas Instruments

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Part # OPA191
Description  OPAx191 36-V, Low-Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp
PDF  57 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA191 Datasheet(HTML) 32 Page - Texas Instruments

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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
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
F
G
R
Gain
1
R
_
_
_
_
OUT
MAX
OUT
MIN
IN
MAX
IN
MIN
V
V
Gain
V
V
_
_
SHUNT
MAX
SHUNT
LOAD
MAX
V
100mV
R
100m
I
1A
:
OUT
LOAD
SHUNT
V
I
R
Gain
u
u
32
OPA191, OPA2191, OPA4191
SBOS701C – DECEMEBER 2015 – REVISED OCTOBER 2019
www.ti.com
Product Folder Links: OPA191 OPA2191 OPA4191
Submit Documentation Feedback
Copyright © 2015–2019, Texas Instruments Incorporated
Typical Applications (continued)
9.2.1.2 Detailed Design Procedure
The transfer function of the circuit in Figure 61 is given in Equation 2
(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.
(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:
(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.
(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 61.
9.2.1.3 Application Curves
Figure 62. Low-Side, Current-Sense, Transfer Function
Figure 63. Low-Side, Current-Sense, Full-Scale Error



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