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INA253 데이터시트(Datasheet) 16 Page - Texas Instruments

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부품명 INA253
상세내용  High Voltage, Bidirectional, Zero-Drift, Current-Shunt Monitor with Integrated 2-mΩ Precision Low Inductive Shunt Resistor
PDF  24 Pages
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제조사  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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 16 page
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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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