ZHCSC57E November   2013  – December 2017 TPS56520 , TPS56720 , TPS56920 , TPS56C20

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用范围
  3. 3 说明
    1.     Device Images
      1.      典型应用电路
  4. 4 修订历史记录
  5. 5 说明 （续）
  6. 6 List of Devices
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
    2.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Switching Characteristics
    8. 8.8 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 PWM Operation
      2. 9.3.2 PWM Frequency and Adaptive On-Time Control
      3. 9.3.3 VIN and Power VIN Terminals (VIN and PVIN)
      4. 9.3.4 Auto-Skip Eco-mode™ Control
      5. 9.3.5 Soft Start and Pre-Biased Soft Start
      6. 9.3.6 Power Good
      7. 9.3.7 Overcurrent Protection
      8. 9.3.8 UVLO Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Operation at Light Loads
    5. 9.5 Programming
      1. 9.5.1 I2C Interface
      2. 9.5.2 I2C Protocol
      3. 9.5.3 I2C Chip Address Byte
    6. 9.6 Register Maps
      1. 9.6.1 I2C Register Address Byte
      2. 9.6.2 Output Voltage Registers
      3. 9.6.3 CheckSum Bit (VOUT Register Only)
      4. 9.6.4 Control Registers
      5. 9.6.5 Latchoff
  10. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 TPS56520, TPS56720 and TPS56920, 5-A, 7-A, and 9-A Converter
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Output Voltage Resistors Selection
            1. 10.2.1.2.1.1 Output Filter Selection
          2. 10.2.1.2.2 Input Capacitor Selection
          3. 10.2.1.2.3 Bootstrap Capacitor Selection
          4. 10.2.1.2.4 VREG5 Capacitor Selection
      2. 10.2.2 TPS56520, TPS56720 and TPS56920 Application Performance Curves
      3. 10.2.3 TPS56C20 12-A Converter
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Design Procedure
        3. 10.2.3.3 TPS56C20 Application Performance Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 器件支持
      1. 13.1.1 开发支持
    2. 13.2 文档支持
      1. 13.2.1 相关文档
    3. 13.3 相关链接
    4. 13.4 商标
    5. 13.5 静电放电警告
    6. 13.6 Glossary
  14. 14机械、封装和可订购信息

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • PWP|20
散热焊盘机械数据 (封装 | 引脚)
订购信息

9.4.1 Operation at Light Loads

The TPS56x20 works in Auto-Skip Eco-modeTM at light load to boost the efficiency. As the output current decreases from heavy load condition, the inductor current is also reduced and eventually comes to the where its ripple valley touches the zero level, which is the boundary between continuous conduction and discontinuous conduction modes. The rectifying MOSFET is turned off when its zero inductor current is detected. As the load current further decreases the converter run into discontinuous conduction mode. The on-time is kept same as it was in the continuous conduction mode because it takes longer to discharge the output capacitor with smaller load current to the level of the nominal output voltage. The transition point to the light load operation IO(LL) current can be estimated with Equation 2 with 500kHz used as ƒsw.

Equation 2. TPS56C20 TPS56920 TPS56720 TPS56520 EQ1_iout_slvscb6.gif