JAJSCZ9C September   2016  – March 2019 INA302 , INA303

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Bidirectional Current Sensing
      2. 8.3.2 Out-of-Range Detection
      3. 8.3.3 Alert Outputs
        1. 8.3.3.1 Setting Alert Thresholds
          1. 8.3.3.1.1 Resistor-Controlled Current Limit
            1. 8.3.3.1.1.1 Resistor-Controlled Current Limit: Example
          2. 8.3.3.1.2 Voltage-Source-Controlled Current Limit
        2. 8.3.3.2 Hysteresis
    4. 8.4 Device Functional Modes
      1. 8.4.1 Alert Operating Modes
        1. 8.4.1.1 Transparent Output Mode
        2. 8.4.1.2 Latch Output Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Selecting a Current-Sensing Resistor (RSENSE)
        1. 9.1.1.1 Selecting a Current-Sensing Resistor: Example
      2. 9.1.2 Input Filtering
      3. 9.1.3 Using the INA30x With Common-Mode Transients Greater Than 36 V
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 関連リンク
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.3.3.1.2 Voltage-Source-Controlled Current Limit

The second method for setting the out-of-range threshold is to directly drive the LIMITx pins with a programmable DAC or other external voltage source. The benefit of this method is the ability to adjust the current-limit threshold to account for different threshold voltages used for different system operating conditions. For example, this method can be used in a system with one current-limit threshold level that must be monitored during a power-up sequence, but different threshold levels must be monitored during other system operating modes.

The voltage applied at the LIMITx pins sets the threshold voltage for out-of-range detection. The value of the voltage for a given desired current trip point is calculated using Equation 4:

Equation 4. INA302 INA303 q_vsource_bos775.gif

where

  • ITRIP is the desired out-of-range current threshold.
  • RSENSE is the current-sensing resistor.
  • GAIN is the gain option of the device selected.
  • VREF is the voltage applied to the REF pin.

NOTE

The maximum voltage that can be applied to the LIMIT2 pin is VS – 0.6 V and the maximum voltage that can be applied to the LIMIT1 pin must not exceed VS.