JAJSNR9B April   2016  – April 2022 INA301-Q1

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  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 Alert Output ( ALERT Pin)
      2. 7.3.2 Current-Limit Threshold
        1. 7.3.2.1 Resistor-Controlled Current Limit
          1. 7.3.2.1.1 Resistor-Controlled, Current-Limit Example
        2. 7.3.2.2 Voltage-Source-Controlled Current Limit
      3. 7.3.3 Hysteresis
    4. 7.4 Device Functional Modes
      1. 7.4.1 Alert Mode
        1. 7.4.1.1 Transparent Output Mode
        2. 7.4.1.2 Latch Output Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Selecting a Current-Sensing Resistor
        1. 8.1.1.1 Selecting a Current-Sensing Resistor Example
      2. 8.1.2 Input Filtering
      3. 8.1.3 INA301-Q1 Operation With Common-Mode Voltage Transients Greater Than 36 V
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 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 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

9 Power Supply Recommendations

The device input circuitry accurately measures signals on common-mode voltages beyond the power-supply voltage, VS. For example, the voltage applied to the VS power-supply pin can be 5 V, whereas the load power-supply voltage being monitored (VCM) can be as high as 36 V. At power up, for applications where the common-mode voltage (VCM) slew rate is greater than 6 V/μs with a final common-mode voltage greater than 20 V, TI recommends that the VS supply be present before VCM. If the use case requires VCM to be present before VS with VCM under these same slewing conditions, then a 331-Ω resistor must be added between the VS supply and the VS pin bypass capacitor.

Power-supply bypass capacitors are required for stability and must be placed as close as possible to the supply and ground pins of the device. A typical value for this supply bypass capacitor is 0.1 µF. Applications with noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise.

During slow power-up events, current flow through the sense resistor or voltage applied to the REF pin can result in the output voltage momentarily exceeding the voltage at the LIMITx pins, resulting in an erroneous indication of an out-of-range event on the ALERTx output. When powering the device with a slow ramping power rail where an input signal is already present, all alert indications should be disregarded until the supply voltage has reached the final value.