ZHCSIH6B July   2018  – October 2019 TPS563231

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
    1.     Device Images
      1.      简化原理图
      2.      TPS563231 效率
  4. 修订历史记录
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. 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 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Adaptive On-Time Control and PWM Operation
      2. 7.3.2 Soft Start and Pre-Biased Soft Start
      3. 7.3.3 Over Current and Short Circuit Protection
      4. 7.3.4 Undervoltage Lockout (UVLO) Protection
      5. 7.3.5 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Continuous Conduction Mode (CCM)
      3. 7.4.3 Pulse Skip Mode (PSM, TPS563231)
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Output Voltage Resistors Selection
        2. 8.2.2.2 Output Filter Selection
        3. 8.2.2.3 Input Capacitor Selection
        4. 8.2.2.4 Bootstrap Capacitor Selection
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 相关链接
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 Glossary
  12. 12机械、封装和可订购信息

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

Over Current and Short Circuit Protection

The TPS563231 is protected from over-current conditions by cycle-by-cycle current limit on the valley of the inductor current. Hiccup mode will be activated if a fault condition persists to prevent over-heating.

The current going through low-side (LS) MOSFET is sensed and monitored. When the LS MOSFET turns on, the inductor current begins to ramp down. The LS MOSFET will not be turned OFF if its current is above the LS current limit ILS_LIMIT even the feedback voltage, VFB, drops below the reference voltage VREF. The LS MOSFET is kept ON so that inductor current keeps ramping down, until the inductor current ramps below the LS current limit ILS_LIMIT. Then the LS MOSFET is turned OFF and the HS switch is turned on after a dead time.

As the inductor current is limited by ILS_LIMT, the output voltage tends to drop as the inductor current may be smaller than the load current. Hiccup current protection mode is activated once the VFB drops below the UVP threshold after a delay time (800 µs typically). In hiccup mode, the regulator is shut down and kept off for 24 ms typically before the TPS563231 try to start again. If over-current or short-circuit fault condition still exists, hiccup will repeat until the fault condition is removed. Hiccup mode reduces power dissipation under severe over-current conditions, prevents over-heating and potential damage to the device.