• Wide supply range enables a direct interface with most microprocessors

7.2.1 High-Side, High-Drive, Solenoid Current-Sense Application

Challenges exist in solenoid drive current sensing that are similar to those in motor inline current sensing. In

certain topologies, the current-sensing amplifier is exposed to the full-scale PWM voltage between ground and

supply. The INA790x is an excellent choice for this type of application. The 400μΩ integrated shunt with a total

system accuracy of 0.35% with a total system drift of 35ppm/°C provides system accuracy across temperature

eliminating the need for system calibration at multiple temperatures.

TI Device

FB

VS

OUT

GND

IN+

IN–

–

+

REF

12V

2.7V to 5.5V

Supply

VS

2

Figure 7-8. Solenoid Drive Application Circuit

7.2.1.1 Design Requirements

For this application, the INA790x measures current in the driver circuit of a 12V, 1A hydraulic valve.

Table 7-5. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Common-mode voltage

12V

Maximum sense current

1A

Power-supply voltage

5V

7.2.1.2 Detailed Design Procedure

To demonstrate the performance of the device, the INA790x , with total gain of 100mV/A (Adjustable Gain =5), is

selected for this design and powered from a 5V supply.

Using the information in the Reference Pin Connections for Bidirectional Current Measurements section, the

reference point is set to midscale by splitting the supply at mid point and connecting the REF.

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INA790A, INA790B

SBOSAA6B – MAY 2024 – REVISED JULY 2025

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