JAJSQV1A July   2023  – October 2023 TPS7H2140-SEP

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. Pin Configuration and Functions
  7. 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 Switching Characteristics
    7. 6.7 Typical Characteristics
  8. Parameter Measurement Information
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Pin Current and Voltage Conventions
      2. 8.3.2 Accurate Current Sense
      3. 8.3.3 Adjustable Current Limit
      4. 8.3.4 Inductive-Load Switching-Off Clamp
      5. 8.3.5 Fault Detection and Reporting
        1. 8.3.5.1 Diagnostic Enable Function
        2. 8.3.5.2 Multiplexing of Current Sense
        3. 8.3.5.3 Fault Table
        4. 8.3.5.4 FAULT Reporting
      6. 8.3.6 Full Diagnostics
        1. 8.3.6.1 Short-to-GND and Overload Detection
        2. 8.3.6.2 Open-Load Detection
          1. 8.3.6.2.1 Channel On
          2. 8.3.6.2.2 Channel Off
        3. 8.3.6.3 Short-to-Input Detection
        4. 8.3.6.4 Reverse Polarity Detection
        5. 8.3.6.5 Thermal Fault Detection
          1. 8.3.6.5.1 Thermal Shutdown
      7. 8.3.7 Full Protections
        1. 8.3.7.1 UVLO Protection
        2. 8.3.7.2 Loss-of-GND Protection
        3. 8.3.7.3 Protection for Loss of Power Supply
        4. 8.3.7.4 Reverse-Current Protection
        5. 8.3.7.5 MCU I/O Protection
      8. 8.3.8 Parallel Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Working Modes
  10. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Examples
        1. 9.4.2.1 Without a GND Network
        2. 9.4.2.2 With a GND Network
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 ドキュメントの更新通知を受け取る方法
    3. 10.3 サポート・リソース
    4. 10.4 Trademarks
    5. 10.5 静電気放電に関する注意事項
    6. 10.6 用語集
  12. 11Mechanical, Packaging, and Orderable Information

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

Accurate Current Sense

High-accuracy current sense is implemented in the TPS7H2140-SEP. It allows a better real-time monitoring effect and more-accurate diagnostics without further calibration.

The integrated current mirror sources a ratio of the load current as: 1 / KCS (where: KCS = 300). This mirrored current flows into the external current sense resistor to become a voltage signal. The current mirror is shared by the four channels. Channel selection is accomplished by using the multiplexer digital inputs (SEL and SEH). ICS can be calculated using Equation 1.

Equation 1. I C S = I O U T x K C S = I O U T x     300

KCS is the ratio of the output current and the sense current (CS). It is a constant value across the temperature and supply voltage (IN). Each device is calibrated accurately during production, so post-calibration is not required. See Figure 8-2 for more details.

GUID-20230302-SS0I-P5HZ-TFGH-ZT04LZ9T1N5S-low.svg Figure 8-2 Current-Sense Block Diagram

When a fault occurs, the CS pin also works as a fault report with a pullup voltage of VCS_FAULT. During a fault the maximum available current in CS is ICS_FAULT (15 mA). See Figure 8-3 for more details.

GUID-20230302-SS0I-5C85-LBRL-SFJDVTVLMCCZ-low.svg Figure 8-3 Current-Sense Output-Voltage Curve

Use Equation 2 to calculate RCS.

Equation 2. R C S = V C S I C S = V C S   ×   K C S   I O U T x

Take the following points into consideration when calculating RCS.

  • Ensure VCS is within the current-sense linear region (VCS_LINEAR, IOUTx_LINEAR) across the full range of the load current. Check RCS with Equation 3.
    Equation 3. R C S = V C S I C S V C S _ L I N E A R ( M A X )   ×   K C S     I O U T x ( M A X )
  • In fault mode, ensure ICS is within the source capacity of the CS pin (ICS_FAULT). Check RCS with Equation 4 .
    Equation 4. R C S = V C S I C S V C S _ F A U L T ( M A X )     I C S _ F A U L T ( M I N )