INA186 datasheet(16/46 Pages) TI

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7.4.3 Bidirectional Mode

The INA186 is a bidirectional current-sense amplifier 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.

VOUT

1.7 V to 5.5 V

IN±

IN+

OUT

Bus Voltage

up to 40 V

RSENSE

Load

Capacitively

Coupled

Amplifier

INA186

REF

GND

ISENSE

Reference

Voltage

CBYPASS

0.1 µF

Figure 7-4. Bidirectional Application

By applying a voltage to the REF pin, Figure 7-4 shows how you can measure this current flowing in both

directions. 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 INA186

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 INA186

returns to the expected value approximately 80 µs after the fault condition is removed.

INA186

SBOS318B – APRIL 2019 – REVISED JULY 2021

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