IN+

IN±

OUT

-

+

Buffer

Current

Feedback

5 V

GND

RL

R1

R1

Bias

48-V

Supply

Load

14

INA293

SBOS470 – DECEMBER 2019

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7.4 Device Functional Modes

7.4.1 Unidirectional Operation

The INA293 measures the differential voltage developed by current flowing through a resistor, commonly referred

to as a current-sensing resistor or a current-shunt resistor. The INA293 operates in unidirectional mode only,

meaning it only senses current sourced from a power supply to a system load as shown in Figure 36.

Figure 36. Unidirectional Application

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

input conditions. The zero current output voltage of the INA293 is very small, with a maximum of GND + 20 mV.

Make sure to apply a differential input voltage of (20 mV / Gain) or greater to keep the INA293 output in the

linear region of operation.

7.4.2 High Signal Throughput

With a bandwidth of 1.3 MHz at a gain of 20 V/V and a slew rate of 2.5 V/µs, the INA293 is specifically designed

for detecting and protecting applications from fast inrush currents. As shown in Table 2, the INA293 responds in

less than 2 µs for a system measuring a 75-A threshold on a 2-mΩ shunt.

Table 2. Response Time

PARAMETER

EQUATION

INA293

G

Gain

20 V/V

Maximum current

100 A

Threshold current

75 A

Current sense resistor value

2 mΩ

Output voltage at maximum current

4 V

Output voltage at threshold current

3 V

SR

Slew rate

2.5 V/µs

Output response time

< 2 µs