INA186 datasheet(23/46 Pages) TI

Part #	INA186

Description	INA186 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Current-Sense Amplifier With Enable

PDF	46 Pages

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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23 / 46 page

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.

OUT

REF

GND

IN+

IN±

LOAD

0.1

5 V

12 V

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

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INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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INA186 Datasheet(PDF) 23 Page - Texas Instruments

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