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TLV9162IDDFR Datasheet(PDF) 29 Page - Texas Instruments

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Part # TLV9162IDDFR
Description  TLV916x 16V, 11MHz, Rail-to-Rail Input/Output, Low Offset Voltage, Low Noise Op Amp
PDF  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV9162IDDFR Datasheet(HTML) 29 Page - Texas Instruments

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7.2.1.2 Detailed Design Procedure
The transfer function of the circuit in Figure 7-1 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
0A to 1A. To keep the shunt voltage below 100mV 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 100mΩ. The voltage drop produced by ILOAD and RSHUNT is
amplified by the TLV9161 to produce an output voltage of 0V to 4.9V. The gain needed by the TLV9161 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 49V/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 TLV9161 to 49V/V.
F
G
R
Gain
1
R
(4)
Choosing RF as 5.76kΩ, RG is calculated to be 120Ω. RF and RG were chosen as 5.76kΩ and 120Ω because
they are standard value resistors that create a 49:1 ratio. Other resistors that create a 49:1 ratio can also be
used. However, excessively large resistors will generate thermal noise that exceeds the intrinsic noise of the op
amp Figure 7-2 shows the measured transfer function of the circuit shown in Figure 7-1.
7.2.1.3 Application Curve
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 7-2. Low-Side, Current-Sense, Transfer Function
www.ti.com
TLV9161, TLV9162, TLV9164
SBOSA68D – NOVEMBER 2021 – REVISED MARCH 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: TLV9161 TLV9162 TLV9164



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