JAJSEX6B December   2017  – October 2019 INA381

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 Wide Input Common-Mode Voltage Range
      2. 8.3.2 Precise Low-Side Current Sensing
      3. 8.3.3 High Bandwidth and Slew Rate
      4. 8.3.4 Alert Output
      5. 8.3.5 Adjustable Overcurrent Threshold
      6. 8.3.6 Comparator Hysteresis
    4. 8.4 Device Functional Modes
      1. 8.4.1 Alert Modes
        1. 8.4.1.1 Transparent Output Mode
        2. 8.4.1.2 Latch Output Mode
  9. 9 Applications and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Select a Current-Sensing Resistor
        1. 9.1.1.1 Select a Current-Sensing Resistor: Example
      2. 9.1.2 Increase Comparator Hysteresis
      3. 9.1.3 Operation With Common-Mode Transients Greater Than 26 V
      4. 9.1.4 Input Filtering
    2. 9.2 Typical Applications
      1. 9.2.1 Bidirectional Window Comparator
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Solenoid Low-Side Current Sensing
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 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 ドキュメントの更新通知を受け取る方法
    3. 12.3 サポート・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 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

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • DGS|10
  • DSG|8
サーマルパッド・メカニカル・データ
発注情報

8.1 Overview

The INA381 is a zero-drift topology, current-sensing amplifier with an integrated comparator that can be used in both low-side and high-side current-sensing and protection applications. This specially designed, current-sensing amplifier accurately measures voltages developed across current-sensing resistors (also known as current-shunt resistors) on common-mode voltages that far exceed the supply voltage powering the device. Current can be measured on input voltage rails as high as 26 V, and the device can be powered from supply voltages as low as 2.7 V. The device can also withstand the full 26-V common-mode voltage at the input pins when the supply voltage is removed without causing damage.

The zero-drift topology enables high-precision measurements with maximum input offset voltages as low as 150 µV, and a temperature contribution of only 1 µV/°C over the full temperature range of –40°C to +125°C. The low total offset voltage of the INA381 enables the use of smaller current-sense resistor values, and allows for more efficient system operation without sacrificing measurement accuracy due to the smaller input signal.

The device uses a reference input that simplifies setting the corresponding current threshold level to use for out-of-range comparison. Combining the precision measurement of the current-sense amplifier and the onboard comparator enables an all-in-one overcurrent detection device. This combination creates a highly-accurate design that quickly detects out-of-range conditions, and allows the system to take corrective actions to prevent potential component or system-wide damage.