SBOS728A February   2015  – March 2021 INA225-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings (1)
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Selecting A Shunt Resistor
        1. 7.3.1.1 Selecting A Current-Sense Resistor Example
        2. 7.3.1.2 Optimizing Power Dissipation versus Measurement Accuracy
      2. 7.3.2 Programmable Gain Select
    4. 7.4 Device Functional Modes
      1. 7.4.1 Input Filtering
      2. 7.4.2 Shutting Down the Device
      3. 7.4.3 Using the Device with Common-Mode Transients Above 36 V
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Microcontroller-Configured Gain Selection
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Unidirectional Operation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
      3. 8.2.3 Bidirectional Operation
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.1.1 Selecting A Current-Sense Resistor Example

The example in Table 7-1 is based on a set of application characteristics, including a 10-A full-scale current range and a 4-V full-scale output requirement. The calculations for selecting a current-sensing resistor of an appropriate value are shown in Table 7-1.

Table 7-1 Calculating the Current-Sense Resistor, RSENSE
PARAMETER EQUATION RESULT
IMAX Full-scale current 10 A
VOUT Full-scale output voltage 4 V
Gain Gain selected Initial selection based on default gain setting. 25 V/V
VDIFF Ideal maximum differential input voltage VDiff = VOUT / Gain 160 mV
RSHUNT Shunt resistor value RSHUNT = VDiff / IMAX 16 mΩ
PRSENSE Current-sense resistor power dissipation RSENSE x IMAX2 1.6 W
VOS Error Offset voltage error (VOS / VDIFF ) x 100 0.094%