9.2.1.2 Detailed Design Procedure

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

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

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

output of the INA296x 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, with high bandwidth and slew rate, can be used to detect fast overcurrent conditions

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

9.2.1.3 Application Curve

Figure 9-2 shows the output response of a solenoid.

Time (100 ms/div)

-5

-1.8

0

-1.5

5

-1.2

10

-0.9

15

-0.6

20

-0.3

25

0

30

0.3

35

0.6

40

0.9

45

1.2

50

1.5

Common-Mode Input Voltage

VOUT

Figure 9-2. Solenoid Control Current Response

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INA296A, INA296B

SBOSA04A – MARCH 2022 – REVISED AUGUST 2022

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