• GAIN is the gain of the current-sense amplifier.

• VSN is the negative output swing of the device.

Table 8-1 shows an example of the different results obtained from using five different gain versions of the

INA310x. From the table data, the highest gain device allows a smaller current-shunt resistor and decreased

power dissipation in the element.

Table 8-1. RSENSE Selection and Power Dissipation(1)

PARAMETER

EQUATION

RESULTS AT VS = 5 V

A1, B1

DEVICES

A2, B2

DEVICES

A3, B3

DEVICES

A4, B4

DEVICES

A5, B5

DEVICES

G

Gain

20 V/V

50 V/V

100 V/V

200 V/V

500 V/V

VDIFF

Ideal differential input voltage

VDIFF = VOUT / G

250 mV

100 mV

50 mV

25 mV

10mV

RSENSE

Current sense resistor value

RSENSE = VDIFF / IMAX

25 mΩ

10 mΩ

5 mΩ

2.5 mΩ

1 mΩ

PSENSE

Current-sense resistor power dissipation

RSENSE × IMAX2

2.5 W

1 W

0.5 W

0.25 W

0.1 W

(1)

Design example with 10-A full-scale current with maximum output voltage set to 5 V.

8.2 Typical Application

The INA310x is a unidirectional, current-sense amplifier capable of measuring currents through a resistive shunt

with shunt common-mode voltages from –4 V to +110 V.

8.2.1 Current Sensing in a Solenoid Application

GND

MCU

24 V

Solenoid

RSENSE

ISENSE

ADC

5 V

G

Comparator

INA310

0.6-V

Reference

CMPOUT

IN+

IN-

OUT

GND

CMPIN

VS

R2

R1

VS

RPull-up

RESET

Figure 8-1. Current Sensing in a Solenoid Application

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INA310A, INA310B

SBOSA86 – MARCH 2023

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