INA186 datasheet(13/46 Pages) TI

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7.3.5 High-Side and Low-Side Current Sensing

The INA186 supports input common-mode voltages from –0.2 V to +40 V. Because of the internal topology,

the common-mode range is not restricted by the power-supply voltage (VS). With the ability to operate with

common-mode voltages greater or less than VS, Figure 7-1 shows an example on how the INA186 can be used

in high-side and low-side current-sensing applications.

Bus Suppl y

up to +40 V

High-Side Se nsing

Low-Side Se nsing

LOA D

Commo n-mode volta ge (VCM)

is b us-voltage depen dent.

Commo n-mode volta ge (VCM)

is a lwa ys n ear groun d a nd is

isolated fro m bus-voltage sp ikes.

IN+

RSENS E

IN±

IN+

IN±

Figure 7-1. High-Side and Low-Side Sensing Connections

7.3.6 High Common-Mode Rejection

The INA186 uses a capacitively coupled amplifier on the front end. Therefore, dc common-mode voltages are

blocked from downstream circuits, resulting in very high common-mode rejection. Typically, the common-mode

rejection of the INA186 is approximately 150 dB. The ability to reject changes in the dc common-mode voltage

allows the INA186 to monitor both high-voltage and low-voltage rail currents with very little change in the offset

voltage.

7.3.7 Rail-to-Rail Output Swing

The INA186 allows linear current-sensing operation with the output close to the supply rail and ground. The

maximum specified output swing to the positive rail is VS – 40 mV, and the maximum specified output swing

to GND is only GND + 1 mV. The close-to-rail output swing is useful to maximize the usable output range,

particularly when operating the device from a 1.8-V supply.

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INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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INA186 Datasheet(PDF) 13 Page - Texas Instruments