JAJSEU4D December   2015  – December 2019 TPS4H160-Q1

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の回路図
      2.      可変電流制限による容量性負荷の駆動
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Switching Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Pin Current and Voltage Conventions
      2. 9.3.2 Accurate Current Sense
      3. 9.3.3 Adjustable Current Limit
      4. 9.3.4 Inductive-Load Switching-Off Clamp
      5. 9.3.5 Fault Detection and Reporting
        1. 9.3.5.1 Diagnostic Enable Function
        2. 9.3.5.2 Multiplexing of Current Sense
        3. 9.3.5.3 Fault Table
        4. 9.3.5.4 STx and FAULT Reporting
      6. 9.3.6 Full Diagnostics
        1. 9.3.6.1 Short-to-GND and Overload Detection
        2. 9.3.6.2 Open-Load Detection
          1. 9.3.6.2.1 Channel On
          2. 9.3.6.2.2 Channel Off
        3. 9.3.6.3 Short-to-Battery Detection
        4. 9.3.6.4 Reverse Polarity Detection
        5. 9.3.6.5 Thermal Fault Detection
          1. 9.3.6.5.1 Thermal Shutdown
      7. 9.3.7 Full Protections
        1. 9.3.7.1 UVLO Protection
        2. 9.3.7.2 Loss-of-GND Protection
        3. 9.3.7.3 Protection for Loss of Power Supply
        4. 9.3.7.4 Reverse-Current Protection
        5. 9.3.7.5 MCU I/O Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Working Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
      1. 12.2.1 Without a GND Network
      2. 12.2.2 With a GND Network
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 ドキュメントの更新通知を受け取る方法
    2. 13.2 コミュニティ・リソース
    3. 13.3 商標
    4. 13.4 静電気放電に関する注意事項
    5. 13.5 Glossary
  14. 14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

9.3.7.4 Reverse-Current Protection

Reverse current occurs in two conditions: short to battery and reverse polarity.

  • When a short to the battery occurs, there is only reverse current through the body diode. IR(1) specifies the limit of the reverse current.
  • In a reverse-polarity condition, there are reverse currents through the body diode and the device GND pin. IR(2) specifies the limit of the reverse current. The GND pin maximum current is specified in the Absolute Maximum Ratings.

To protect the device, TI recommends two types of external circuitry.

  • Adding a blocking diode. Both the IC and load are protected when in reverse polarity.
    • TPS4H160-Q1 rev-curr-prot1_SLVSCV8.gifFigure 33. Reverse-Current External Protection, Method 1
  • Adding a GND network. The reverse current through the device GND is blocked. The reverse current through the FET is limited by the load itself. TI recommends a resistor in parallel with the diode as a GND network. The recommended selection are 1-kΩ resistor in parallel with an >100-mA diode. If multiple high-side switches are used, the resistor and diode can be shared among devices. The reverse current protection diode in the GND network forward voltage should be less than 0.6 V in any circumstances. In addition a minimum resistance of 4.7 K is recommended on the I/O pins.
TPS4H160-Q1 rev-curr-prot2_SLVSCV8.gifFigure 34. Reverse-Current External Protection, Method 2