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TLC2274A-EP Datasheet(PDF) 26 Page - Texas Instruments

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Part No. TLC2274A-EP
Description  Advanced LinCMOS Rail-to-Rail Operational Amplifiers
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC2274A-EP Datasheet(HTML) 26 Page - Texas Instruments

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OUT
S
Load
R
V
R
I
R
=
´
´
1
1
2
g
g
g
2
OUT
BAT
S
Load
1
1
2
2
R
1
R
R
R
1
2 R
R
R
R
R
V
V
R
I
R
R
R
1
1
R
R
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1
1
2
g
g
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2
1
2
OUT
1
2
1
1
2
2
R
1
R
R
R
1
2 R
R
R
R
R
V
V
V
(V
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R
R
R
2
1
1
R
R
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RS
V1
V2
VBAT
R1
VOUT
ILOAD
ILOUD
R2
0.1 µF
R
Rg
47 k
26
TLC2272, TLC2272A, TLC2272M, TLC2272AM
TLC2274, TLC2274A, TLC2274M, TLC2274AM
SLOS190H – FEBRUARY 1997 – REVISED MARCH 2016
www.ti.com
Product Folder Links: TLC2272 TLC2272A TLC2272M TLC2272AM TLC2274 TLC2274A TLC2274M TLC2274AM
Submit Documentation Feedback
Copyright © 1997–2016, Texas Instruments Incorporated
8.2 Typical Application
8.2.1 High-Side Current Monitor
Figure 60. Equivalent Schematic (Each Amplifier)
8.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 3 as the input parameters.
Table 3. Design Parameters
PARAMETER
VALUE
VBAT
Battery Voltage
12 V
RSENSE
Sense Resistor
0.1
Ω
ILOAD
Load Current
0 A to 10 A
Operational Amplifier
Set in Differential configuration with Gain = 10
8.2.1.2 Detailed Design Procedure
This circuit is designed for measuring the high-side current in automotive body control modules with 12-V battery
or similar applications. The operational amplifier is set as differential with an external resistor network.
8.2.1.2.1
Differential Amplifier Equations
Equation 1 and Equation 2 are used to calculate VOUT.
(1)
(2)
In an ideal case R1 = R and R2 = Rg, and VOUT can then be calculated using Equation 3:
(3)


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