INA253

REF2

VS

OUT

GND

IN+

IN±

±

+

REF1

12 V

2.7-V to 5.5-V

Supply

21

INA253

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SLOS954A – JULY 2018 – REVISED DECEMBER 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 overtemperature 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 an excellent choice 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 41. 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