Table 8-3. Design Parameters (continued)

DESIGN PARAMETERS

EXAMPLE VALUE

Maximum sense current

1.5 A

50 mΩ

Gain option

50 V/V

8.2.2 Detailed Design Procedure

The INA293-Q1 is designed to measure current in a typical solenoid application. The INA293-Q1 measures

current across the 50-mΩ shunt that is placed at the output of the half-bridge. The INA293-Q1 measures the

differential voltage across the shunt resistor, and the signal is internally amplified with a gain of 50 V/V. The

output of the INA293-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 INA293-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.

The INA293-Q1 is a unidirectional current sense amplifier that is meant to operate with a positive differential

8.2.3 Application Curve

Figure 8-3 shows the output response of a solenoid.

0

10

20

30

40

0

2

4

6

Time (50 ms/div)

VCM

VOUT

Figure 8-3. Solenoid Control Current Response

9 Power Supply Recommendations

The INA293-Q1 power supply can be 5 V, whereas the input common-mode voltage can vary between –4 V to

110 V. The output voltage range of the OUT pin, however, is limited by the voltage on the power-supply pin.

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INA293-Q1

SBOS870A – MAY 2019 – REVISED SEPTEMBER 2020

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