ZHCSQ77A February   2023  – September 2023 TPS25948

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Electrical Characteristics
    5. 7.5 Timing Requirements
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Undervoltage Lockout (UVLO and UVP)
      2. 8.3.2 Overvoltage Lockout (OVLO)
      3. 8.3.3 Inrush Current, Overcurrent, and Short Circuit Protection
        1. 8.3.3.1 Slew Rate (dVdt) and Inrush Current Control
        2. 8.3.3.2 Active Current Limiting
        3. 8.3.3.3 Short-Circuit Protection
      4. 8.3.4 Analog Load Current Monitor
      5. 8.3.5 Reverse Current Protection
      6. 8.3.6 Overtemperature Protection (OTP)
      7. 8.3.7 Fault Response and Indication (FLT)
      8. 8.3.8 Supply Good Indication (SPLYGD/SPLYGD)
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Single Device, Self-Controlled
    3. 9.3 Typical Application
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Setting Overvoltage Threshold
        2. 9.3.2.2 Setting Output Voltage Rise Time (tR)
        3. 9.3.2.3 Setting Overcurrent Threshold (ILIM)
        4. 9.3.2.4 Setting Overcurrent Blanking Interval (tITIMER)
      3. 9.3.3 Application Curves
    4. 9.4 Active ORing
    5. 9.5 Priority Power MUXing
    6. 9.6 Parallel Operation
    7. 9.7 USB PD Port Protection
    8. 9.8 Power Supply Recommendations
      1. 9.8.1 Transient Protection
      2. 9.8.2 Output Short-Circuit Measurements
    9. 9.9 Layout
      1. 9.9.1 Layout Guidelines
      2. 9.9.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 Trademarks
    5. 10.5 静电放电警告
    6. 10.6 术语表
  12. 11Mechanical, 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

8.3.2 Overvoltage Lockout (OVLO)

The TPS25948xx allows the user to implement Overvoltage protection on the bus to shield the system against supply overvoltage conditions. The internal fast comparator on the OVLO pin allows the Overvoltage Lockout threshold to be adjusted to a user defined value. Once the voltage at the OVLO pin crosses the OVLO rising threshold VOV(R), the device turns off both the FETs to cut off the power path. Thereafter, the devices wait for the voltage at the OVLO pin to fall below the OVLO falling threshold VOV(F) before the FETs are turned ON again. The rising and falling thresholds are slightly different to provide hysterisis. Figure 9-34 and Equation 2 show how a resistor divider can be used to set the OVLO set point for a given voltage supply.

GUID-20230214-SS0I-LKKR-4QX0-RPX8FQX2RVBF-low.svgFigure 8-5 Adjustable Overvoltage Protection
Equation 2. VIN(OV)  = VOV(F) × R1 + R2R2 
While recovering from a OVLO event, the TPS25948xx bypasses the inrush control (dVdt) and starts up in a current limited manner to provide faster turn ON and minimize power supply droop during supply transient conditions.
GUID-20230216-SS0I-RNL0-1G3V-WGXVD5B0G54T-low.svgFigure 8-6 TPS25948xx Overvoltage Lockout and Recovery