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INA186A1IDDFT Scheda tecnica(PDF) 23 Page - Texas Instruments

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Il numero della parte INA186A1IDDFT
Spiegazioni elettronici  INA186 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Current-Sense Amplifier With Enable
PDF  46 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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INA186A1IDDFT Scheda tecnica(HTML) 23 Page - Texas Instruments

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8.2 Typical Applications
The low input bias current of the INA186 allows accurate monitoring of small-value currents. To accurately
monitor currents in the microamp range, increase the value of the sense resistor to increase the sense
voltage so that the error introduced by the offset voltage is small. Figure 8-6 shows the circuit configuration
for monitoring low-value currents. As a result of the differential input impedance of the INA186, limit the value of
RSENSE to 1 kΩ or less for best accuracy.
VS
OUT
REF
GND
IN+
IN±
LOAD
0.1
F
5 V
12 V
R
SENSE
” 1 kO
INA186
Figure 8-6. Microamp Current Measurement
8.2.1 Design Requirements
Table 8-1 lists the design requirements for the circuit shown in Figure 8-6.
Table 8-1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Power-supply voltage (VS)
5 V
Bus supply rail (VCM)
12 V
Minimum sense current (IMIN)
1 µA
Maximum sense current (IMAX)
150 µA
Device gain (GAIN)
25 V/V
Reference voltage (VREF)
0 V
www.ti.com
INA186
SBOS318B – APRIL 2019 – REVISED JULY 2021
Copyright © 2021 Texas Instruments Incorporated
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