INA190 datasheet(18/48 Pages) TI2

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VOUT

1.7 V to 5.5 V

IN±

IN+

OUT

Bus Voltage

up to 40 V

RSENS E

Loa d

Capacitive ly

Couple d

Amplifier

ENABL E

INA190

REF

GND

ISENS E

Reference

Voltage

CBYPASS

0.1 µF

INA190

SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

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Device Functional Modes (continued)

7.4.3 Bidirectional Mode

The INA190 devices are bidirectional current-sense amplifiers capable of measuring currents through a resistive

shunt in two directions. This bidirectional monitoring is common in applications that include charging and

discharging operations where the current flowing through the resistor can change directions.

Figure 37. Bidirectional Application

The ability to measure this current flowing in both directions is achieved by applying a voltage to the REF pin, as

shown in Figure 37. The voltage applied to REF (VREF) sets the output state that corresponds to the zero-input

level state. The output then responds by increasing above VREF for positive differential signals (relative to the IN–

pin) and responds by decreasing below VREF for negative differential signals. This reference voltage applied to

the REF pin can be set anywhere between 0 V to VS. For bidirectional applications, VREF is typically set at VS/2

for equal signal range in both current directions. In some cases, VREF is set at a voltage other than VS/2; for

example, when the bidirectional current and corresponding output signal do not need to be symmetrical.

7.4.4 Input Differential Overload

If the differential input voltage (VIN+ – VIN–) times gain exceeds the voltage swing specification, the INA190 drives

its output as close as possible to the positive supply or ground, and does not provide accurate measurement of

the differential input voltage. If this input overload occurs during normal circuit operation, then reduce the value of

the shunt resistor or use a lower-gain version with the chosen sense resistor to avoid this mode of operation. If a

differential overload occurs in a time-limited fault event, then the output of the INA190 returns to the expected

value approximately 80 µs after the fault condition is removed.

INA190 Datasheet(PDF) 18 Page - Texas Instruments

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