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TLV9152 Datenblatt(PDF) 28 Page - Texas Instruments

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Teilenummer TLV9152
Bauteilbeschribung  TLV915x-Q1 4.5-MHz, Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Automotive Op Amp
PDF  45 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TLV9152 Datenblatt(HTML) 28 Page - Texas Instruments

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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
defined 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 TLV9151-Q1 to produce an output voltage of 0 V to 4.9 V. The gain needed by the TLV9151-Q1
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
is used to size the resistors, RF and RG, to set the gain of the TLV9151-Q1 to 49 V/V.
F
G
R
Gain
1
R
(4)
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 8-2 shows the measured transfer function of the circuit shown in Figure 8-1.
8.2.1.3 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 8-2. Low-Side, Current-Sense, Transfer Function
TLV9152-Q1, TLV9154-Q1
SBOSA23B – MAY 2020 – REVISED MARCH 2021
www.ti.com
28
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: TLV9152-Q1 TLV9154-Q1



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