ZHCST11 February   2024 INA185-Q1

PRODUCTION DATA  

  1.   1
  2. 特性
  3. 应用
  4. 说明
  5. Pin Configuration and Functions
  6. Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
  7. Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagrams
    3. 6.3 Feature Description
      1. 6.3.1 High Bandwidth and Slew Rate
      2. 6.3.2 Bidirectional Current Monitoring
      3. 6.3.3 Wide Input Common-Mode Voltage Range
      4. 6.3.4 Precise Low-Side Current Sensing
      5. 6.3.5 Rail-to-Rail Output Swing
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Mode
      2. 6.4.2 Unidirectional Mode
      3. 6.4.3 Bidirectional Mode
      4. 6.4.4 Input Differential Overload
      5. 6.4.5 Shutdown Mode
  8. Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Basic Connections
      2. 7.1.2 RSENSE and Device Gain Selection
      3. 7.1.3 Signal Filtering
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Common-Mode Transients Greater Than 26V
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 接收文档更新通知
    4. 8.4 支持资源
    5. 8.5 Trademarks
    6. 8.6 静电放电警告
    7. 8.7 术语表
  10. Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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Unidirectional Mode

This device is capable of monitoring current flowing in one direction (unidirectional) or in both directions (bidirectional) depending on how the REF pin is configured. The most common case is unidirectional, where the output is set to ground when no current is flowing by connecting the REF pin to ground, as shown in Figure 6-2. When the current flows from the bus supply to the load, the input signal across IN+ to IN– increases, and causes the output voltage at the OUT pin to increase.

GUID-20240221-SS0I-Z7JL-BRPK-WB90PBRFXMP4-low.svg Figure 6-2 Unidirectional Application

The linear range of the output stage is limited by how close the output voltage can approach ground under zero input conditions. In unidirectional applications where measuring very low input currents is desirable, bias the REF pin to a convenient value above 50mV to get the output into the linear range of the device. To limit common-mode rejection errors, buffer the reference voltage connected to the REF pin.

A less-frequently used output biasing method is to connect the REF pin to the power-supply voltage, VS. This method results in the output voltage saturating at 25mV less than the supply voltage when no differential input signal is present. This method is similar to the output saturated low condition with no input signal when the REF pin is connected to ground. The output voltage in this configuration only responds to negative currents that develop negative differential input voltage relative to the device IN– pin. Under these conditions, when the differential input signal increases negatively, the output voltage moves downward from the saturated supply voltage. The voltage applied to the REF pin must not exceed VS.