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LMV358AIDGKR Datasheet(PDF) 17 Page - Texas Instruments

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Part No. LMV358AIDGKR
Description  LMV3xxA Low-Voltage Rail-to-Rail Output Operational Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LMV358AIDGKR Datasheet(HTML) 17 Page - Texas Instruments

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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 Figure 8-1 is given in Equation 1.
OUT
LOAD
SHUNT
V
I
R
Gain
u
u
(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.
_
_
SHUNT
MAX
SHUNT
LOAD
MAX
V
100mV
R
100m
I
1A
:
(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.
_
_
_
_
OUT
MAX
OUT
MIN
IN
MAX
IN
MIN
V
V
Gain
V
V
(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.
F
G
R
Gain
1
R
(4)
Selecting RF as 57.6 kΩ and RG as 1.2 kΩ provides a combination that equals 49 V/V. Figure 8-2 shows the
measured transfer function of the circuit shown in Figure 8-1. Notice that the gain is only a function of the
feedback and gain resistors. This gain is adjusted by varying the ratio of the resistors and the actual resistors
values are determined by the impedance levels that the designer wants to establish. The impedance level
determines the current drain, the effect that stray capacitance has, and a few other behaviors. There is no
optimal impedance selection that works for every system, you must choose an impedance that is ideal for your
system parameters.
www.ti.com
LMV321A,, LMV358A,, LMV324A
SBOS923G – DECEMBER 2017 – REVISED FEBRUARY 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: LMV321A, LMV358A, LMV324A


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