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INA253 Datasheet(PDF) 16 Page - Texas Instruments |
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INA253 Datasheet(HTML) 16 Page - Texas Instruments |
16 / 24 page 2.7V to 5.5V Supply INA253 REF2 VS OUT GND IN+ IN- - + REF1 48V 16 INA253 SLOS954 – MAY 2018 www.ti.com Product Folder Links: INA253 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 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. |
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