ZHCSLH7C June   2020  – June 2021 INA2290 , INA290 , INA4290

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    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 Amplifier Input Common-Mode Range
      2. 7.3.2 Input-Signal Bandwidth
      3. 7.3.3 Low Input Bias Current
      4. 7.3.4 Low VSENSE Operation
      5. 7.3.5 Wide Fixed-Gain Output
      6. 7.3.6 Wide Supply Range
    4. 7.4 Device Functional Modes
      1. 7.4.1 Unidirectional Operation
      2. 7.4.2 High Signal Throughput
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 RSENSE and Device Gain Selection
      2. 8.1.2 Input Filtering
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Overload Recovery With Negative VSENSE
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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8.2.2 Detailed Design Procedure

The maximum value of the current-sense resistor is calculated based on the choice of gain, value of the maximum current to be sensed (IMAX), and the power-supply voltage (VS). When operating at the maximum current, the output voltage must not exceed the positive output swing specification, VSP. Under the given design parameters, Equation 6 calculates the maximum value for RSENSE as 19.2 mΩ.

Equation 6. GUID-20200713-CA0I-RB5N-0HJ8-JNH9DN6GVL6K-low.gif

Although 15 mΩ is less than the maximum value calculated, 15 mΩ is selected for this design example because this value is still large enough to provide an adequate signal at the current-sense amplifier output.