INA190A3NDDFREP datasheet(18/37 Pages) TI

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7.4.3 Bidirectional Mode

The INA190-EP 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.

VOUT

1.7 V to 5.5 V

IN–

IN+

OUT

–

Bus Voltage

up to 40 V

RSENSE

Load

Capacitively

Coupled

Amplifier

ENABLE

INA190-EP

REF

GND

ISENSE

–

Reference

Voltage

CBYPASS

0.1 µF

Figure 7-4. Bidirectional Application

The user can apply a voltage to the REF pin to measure this current flowing in both directions (see Figure 7-4).

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-

EP 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-EP

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

INA190-EP

SBOSA74 – MAY 2022

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