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LMV358AIDGKT Datasheet(PDF) 17 Page - Texas Instruments

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Part No. LMV358AIDGKT
Description  Low-Voltage Rail-to-Rail Output Operational Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMV358AIDGKT Datasheet(HTML) 17 Page - Texas Instruments

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0
1
2
3
4
5
0
0.2
0.4
0.6
0.8
1
I
LOAD (A)
C219
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
17
LMV321A, LMV358A, LMV324A
www.ti.com
SBOS923B – DECEMBER 2017 – REVISED JUNE 2018
Product Folder Links: LMV321A LMV358A LMV324A
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Typical Application (continued)
8.2.1.1 Design Requirements
The design requirements for this design are:
Load current: 0 A to 1 A
Output voltage: 4.9 V
Maximum shunt voltage: 100 mV
8.2.1.2 Detailed Design Procedure
The transfer function of the circuit in is given in Equation 1:
(1)
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
shown using Equation 2:
(2)
Using Equation 2, RSHUNT is calculated to be 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is
amplified by the LMV3xxA to produce an output voltage of approximately 0 V to 4.9 V. The gain needed by the
LMV3xxA to produce the necessary output voltage is calculated using Equation 3:
(3)
Using Equation 3, the required gain is calculated to be 49 V/V, which is set with resistors RF and RG. Equation 4
sizes the resistors RF and RG, to set the gain of the LMV3xxA to 49 V/V.
(4)
Selecting RF as 57.6 kΩ and RG as 1.2 kΩ provides a combination that equals 49 V/V. Figure 33 shows the
measured transfer function of the circuit shown in Figure 32.
8.2.1.3 Application Curve
Figure 33. Low-Side, Current-Sense Transfer Function


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