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LM2902LV-Q1 Datasheet(PDF) 17 Page - Texas Instruments

Part # LM2902LV-Q1
Description  LM290xLV-Q1 Industry Standard, Low Voltage Automotive Operational Amplifiers
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM2902LV-Q1 Datasheet(HTML) 17 Page - Texas Instruments

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Using Equation 2, RSHUNT is calculated to be 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is
amplified by the LM290xLV-Q1 device to produce an output voltage of approximately 0 V to 3.5 V. The gain
needed by the LM290xLV-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 35 V/V, which is set with resistors RF and RG. Equation 4
sizes the resistors RF and RG, to set the gain of the LM290xLV-Q1 device to 35 V/V.
F
G
R
Gain
1
R
(4)
8.2.3 Application Curve
Selecting RF as 255 kΩ and RG as 7.5 kΩ provides a combination that equals 35 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.
ILOAD (A)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.5
1
1.5
2
2.5
3
3.5
Outp
Figure 8-2. Low-Side, Current-Sense Transfer Function
www.ti.com
LM2902LV-Q1, LM2904LV-Q1
SBOS987B – AUGUST 2020 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
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Product Folder Links: LM2902LV-Q1 LM2904LV-Q1


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