INA296A datasheet(24/49 Pages) TI2

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8.2.1 Current Sensing in a Solenoid Application

22V

INA

OUT

IN+

IN–

GND

REF2

REF1

50m

Control

Figure 8-1. Solenoid Drive Application Circuit

8.2.1.1 Design Requirements

In this example application, the common-mode voltage ranges from 0V to 22V. The maximum sense current

is 1.25A, and a 5V supply is available for the INA296x-Q1 . Following the design guidelines from RSENSE and

Device Gain Selection, a RSENSE of 50mΩ and a gain of 20V/V are selected to provide good output dynamic

range. Table 8-2 lists the design setup for this application.

Table 8-2. Design Parameters

DESIGN PARAMETERS

EXAMPLE VALUE

Power supply voltage

Common mode voltage range

0V to 22V

Maximum sense current

1.25A

RSENSE resistor

50mΩ

Gain option

20V/V

8.2.1.2 Detailed Design Procedure

The INA296x-Q1 is designed to measure current in a typical solenoid application. The INA296x-Q1 measures

current across the 50mΩ shunt that is placed at the output in series with solenoid. The INA296x-Q1 measures

the differential voltage across the shunt resistor, and the signal is internally amplified with a gain of 20V/V. The

output of the INA296x-Q1 is connected to the analog-to-digital converter (ADC) of an MCU to digitize the current

measurements.

Solenoid loads are highly inductive and are often prone to failure. Solenoids are often used for position control,

precise fluid control, and fluid regulation. Measuring real-time current on the solenoid continuously can indicate

premature failure of the solenoid, which can lead to a faulty control loop in the system. Measuring high-side

current also indicates if there are any ground faults on the solenoid or the FETs that can be damaged in

an application. The INA296x-Q1 , with high bandwidth and slew rate, can be used to detect fast overcurrent

conditions to prevent the solenoid damage from short-to-ground faults.

8.2.1.3 Application Curve

Figure 8-2 shows the output response of a solenoid.

INA296A-Q1, INA296B-Q1

SBOSA32D – FEBRUARY 2023 – REVISED JUNE 2025

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