2.7V to 5.5V

Supply

INA253

REF2

OUT

GND

IN+

IN-

-

+

REF1

48V

16

INA253

SLOS954 – MAY 2018

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9.2 Typical Applications

The INA253 offers advantages for multiple applications including the following:

•

High common-mode range and excellent CMRR enables direct inline sensing

•

Precision low inductive, low drift shunt eliminates the need for over temperature system calibration

•

Ultra-low offset and drift eliminates the necessity of calibration

•

Wide supply range enables a direct interface with most microprocessors

9.2.1 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 INA253 is well suited for this type of application. The 2-mΩ integrated shunt with a total system

accuracy of 0.2% with a total system drift of 25 ppm/°C provides system accuracy across temperature eliminating

the need for tri temperature system calibration.

Figure 13. Solenoid Drive Application Circuit

9.2.1.1 Design Requirements

For this application, the INA253 measures current in the driver circuit of a 12-V, 500-mA hydraulic valve.

Table 2. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Common mode - voltage

12 V

Maximum sense current

500 mA

Power-supply voltage

3.3 V

9.2.1.2 Detailed Design Procedure

To demonstrate the performance of the device, the INA253 with a gain of 400mV/A was selected for this design

and powered from a 5-V supply.

Using the information in the Output Set to Mid-Supply Voltage section, the reference point is set to midscale by

splitting the supply with REF1 connected to ground and REF2 connected to supply. Alternatively, the reference

pins can be tied together and driven with an external precision reference.