INA190 datasheet(16/48 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

CBYPASS

0.1 µF

INA190

SBOS863D – MARCH 2018 – REVISED NOVEMBER 2019

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7.4 Device Functional Modes

7.4.1 Normal Operation

The INA190 is in normal operation when the following conditions are met:

•

The power-supply voltage (VS) is between 1.7 V and 5.5 V.

•

The common-mode voltage (VCM) is within the specified range of –0.2 V to +40 V.

•

The maximum differential input signal times the gain plus VREF is less than the positive swing voltage VSP.

•

The ENABLE pin is driven or connected to VS.

•

The minimum differential input signal times the gain plus VREF is greater than the zero load swing to GND, VZL

(see the Rail-to-Rail Output Swing section).

During normal operation, this device produces an output voltage that is the amplified representation of the

difference voltage from IN+ to IN– plus the voltage applied to the REF pin.

7.4.2 Unidirectional Mode

This device can be configured to monitor current flowing in one direction (unidirectional) or in both directions

(bidirectional) depending on how the REF pin is connected. The most common case is unidirectional where the

output is set to ground when no current is flowing by connecting the REF pin to ground, as shown in Figure 35.

When the current flows from the bus supply to the load, the input voltage from IN+ to IN– increases and causes

the output voltage at the OUT pin to increase.

Figure 35. Typical Unidirectional Application

The linear range of the output stage is limited by how close the output voltage can approach ground under zero

input conditions. The zero current output voltage of the INA190 is very small and for most unidirectional

applications the REF pin is simply grounded. However, if the measured current multiplied by the current sense

resistor and device gain is less than the zero current output voltage then bias the REF pin to a convenient value

above the zero current output voltage to get the output into the linear range of the device. To limit common-mode

rejection errors, buffer the reference voltage connected to the REF pin.

A less-frequently used output biasing method is to connect the REF pin to the power-supply voltage, VS. This

method results in the output voltage saturating at 40 mV less than the supply voltage when no differential input

voltage is present. This method is similar to the output saturated low condition with no differential input voltage

when the REF pin is connected to ground. The output voltage in this configuration only responds to currents that

develop negative differential input voltage relative to the device IN– pin. Under these conditions, when the

negative differential input signal increases, the output voltage moves downward from the saturated supply

voltage. The voltage applied to the REF pin must not exceed VS.

INA190 Datasheet(PDF) 16 Page - Texas Instruments

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