INA190 datasheet(25/48 Pages) TI2

부품명	INA190

상세설명	INA190 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Precision Current-Sense Amplifier With Enable

PDF	48 Pages

Scroll/Zoom	100%

제조업체	TI2 [Texas Instruments]

홈페이지	https://www.ti.com

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25 / 48 page

ENABLE

OUT

REF

GND

IN+

IN±

LOAD

0.1

5 V

12 V

SENSE

” 1 kO

INA190

www.ti.com

SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

Product Folder Links: INA190

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8.2 Typical Applications

The low input bias current of the INA190 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. The circuit configuration for monitoring low-value

currents is shown in Figure 44. As a result of the differential input impedance of the INA190, limit the value of

RSENSE to 1 kΩ or less for best accuracy.

Figure 44. Microamp Current Measurement

8.2.1 Design Requirements

The design requirements for the circuit shown in Figure 44 are listed in Table 1.

Table 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

Amplifier current in sleep or disabled state

< 1 µA

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