JAJSUQ8B June   2024  – July 2024 TPSM81033

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 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 Undervoltage Lockout
      2. 6.3.2 Enable and Soft Start
      3. 6.3.3 Setting the Output Voltage
      4. 6.3.4 Pass-Through Operation
      5. 6.3.5 Power Good Indicator
      6. 6.3.6 Implement Output Discharge by PG function
      7. 6.3.7 Overvoltage Protection
      8. 6.3.8 Output Short-to-Ground Protection
      9. 6.3.9 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 PWM Mode
      2. 6.4.2 Power-Save Mode
  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 Setting the Output Voltage
        2. 7.2.2.2 Output Capacitor Selection
        3. 7.2.2.3 Input Capacitor Selection
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 サード・パーティ製品に関する免責事項
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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発注情報

6.3.2 Enable and Soft Start

When the input voltage is above the UVLO rising threshold and the EN pin is pulled to a voltage above 1.2V, the TPSM81033 is enabled and starts up. To minimize the inrush current during start up, the TPSM81033 has a soft start up function. At the beginning, the TPSM81033 enters pre-charge phase and charges the output capacitors with a current of approximately 330mA when the output voltage is below 0.4V. When the output voltage is charged above 0.4V, the output current is changed to having output current capability to drive the 2Ω resistance load. To minimize the inrush current further, the TPSM810333 has a maximum pre-charge current of 900mA(typical). After the output voltage reaches the input voltage, the TPSM81033 starts switching, and the reference voltage ramps up a 0.8mV/μs. When the voltage at the EN pin is below 0.4V, the internal enable comparator turns the device into shutdown mode. In the shutdown mode, the device is entirely turned off. The output is disconnected from input power supply.