ZHCSUB8V June   1976  – February 2025

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics: UA78M33 (Both Legacy and New Chip)
    6. 5.6  Electrical Characteristics: UA78M05 (Both Legacy and New Chip)
    7. 5.7  Electrical Characteristics: UA78M06C (Legacy Chip Only)
    8. 5.8  Electrical Characteristics: UA78M08C (Legacy Chip Only)
    9. 5.9  Electrical Characteristics: UA78M09 (Both Legacy and New Chip)
    10. 5.10 Electrical Characteristics: UA78M10  (Both Legacy and New Chip)
    11. 5.11 Electrical Characteristics: UA78M12  (Both Legacy and New Chip)
    12. 5.12 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Current Limit
      2. 6.3.2 Dropout Voltage (VDO)
      3. 6.3.3 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Input and Output Capacitor Requirements
        2. 7.2.2.2 Power Dissipation (PD)
        3. 7.2.2.3 Estimating Junction Temperature
        4. 7.2.2.4 External Capacitor Requirements
        5. 7.2.2.5 Overload Recovery
        6. 7.2.2.6 Reverse Current
        7. 7.2.2.7 Polarity Reversal Protection
      3. 7.2.3 Application Curves
    3. 7.3 System Examples
      1. 7.3.1 Positive Regulator in Negative Configuration
      2. 7.3.2 Current Limiter Circuit
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Evaluation Module
      2. 8.1.2 Device Nomenclature
    2. 8.2 接收文档更新通知
    3. 8.3 支持资源
    4. 8.4 Trademarks
    5. 8.5 静电放电警告
    6. 8.6 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.2.2.7 Polarity Reversal Protection

In many applications, a voltage regulator powers a load that is not connected to ground, but instead, is connected to a voltage source of the opposite polarity (for example, operational amplifiers, level-shifting circuits, and so on). During start-up and short-circuit events, this connection can lead to polarity reversal of the regulator output and can damage the internal components of the regulator.

To avoid polarity reversal on the regulator output, use external protection to protect the device.

Figure 7-3 shows one approach for protecting the device.

uA78M Example Circuit for Polarity Reversal Protection Using a Schottky Diode Figure 7-3 Example Circuit for Polarity Reversal Protection Using a Schottky Diode