ZHCSJE3C February   2019  – August 2021 INA191 , INA2191

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. Pin Configuration and Functions
  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. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Precision Current Measurement
      2. 7.3.2 Low Input Bias Current
      3. 7.3.3 Low Quiescent Current With Output Enable
      4. 7.3.4 Bidirectional Current Monitoring (INA2191 Only)
      5. 7.3.5 High-Side and Low-Side Current Sensing
      6. 7.3.6 High Common-Mode Rejection
      7. 7.3.7 Rail-to-Rail Output Swing
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Unidirectional Mode
      3. 7.4.3 Bidirectional Mode (INA2191 Only)
      4. 7.4.4 Input Differential Overload
      5. 7.4.5 Shutdown
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Basic Connections
      2. 8.1.2 RSENSE and Device Gain Selection
      3. 8.1.3 Signal Conditioning
      4. 8.1.4 Common-Mode Voltage Transients
    2. 8.2 Typical Application
      1. 8.2.1 Microamp Current Measurement
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
  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 Electrostatic Discharge Caution
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • YFD|6
散热焊盘机械数据 (封装 | 引脚)
订购信息

Detailed Design Procedure

The maximum value of the current-sense resistor is calculated based on choice of gain, value of the maximum current the 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. For the given design parameters, the maximum value for RSENSE calculated in Equation 6 is 1.321 kΩ.

Equation 6. GUID-0A3695C7-A6B2-4E97-8680-D4D11EE5FE94-low.gif

However, because this value exceeds the maximum recommended value for RSENSE, a resistance value of 1 kΩ must be used. When operating at the minimum current value, IMIN the output voltage must be greater than the swing to GND (VSN), specification. For this example, the output voltage at the minimum current (VOUTMIN) calculated in Equation 7 is 25 mV, which is greater than the value for VSN.

Equation 7. GUID-6B5E2039-441D-4DCD-9ED6-EA2B07829960-low.gif