ZHCSEL3B November   2015  – January 2016 UCC28881

PRODUCTION DATA.  

  1. 特性
  2. 应用
  3. 说明
  4. 修订历史记录
  5. Device Comparison
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-Up Operation
      2. 8.4.2 Feedback and Voltage Control Loop
      3. 8.4.3 PWM Controller
      4. 8.4.4 Current Limit
      5. 8.4.5 Inductor Current Runaway Protection
      6. 8.4.6 Over Temperature Protection
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 13-V, 225-mA High-Side Buck Converter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Input Stage (RF, D2, D3, C1, C2, L2)
          2. 9.2.1.2.2 Regulator Capacitor (CVDD)
          3. 9.2.1.2.3 Freewheeling Diode (D1)
          4. 9.2.1.2.4 Output Capacitor (CL)
          5. 9.2.1.2.5 Pre-Load Resistor (RL)
          6. 9.2.1.2.6 Inductor (L1)
          7. 9.2.1.2.7 Feedback Path (CFB, RFB1 and RFB2) and Load Resistor (RL)
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Additional UCC28881 Application Topologies
        1. 9.2.2.1 Low-Side Buck and LED Driver - Direct Feedback (Level Shifted)
        2. 9.2.2.2 High-Side Buck Converter
        3. 9.2.2.3 Non-Isolated, Low-Side Buck-Boost Converter
        4. 9.2.2.4 Non-Isolated, High-Side Buck-Boost Converter
        5. 9.2.2.5 Non-Isolated Flyback Converter
        6. 9.2.2.6 Isolated Flyback Converter
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 器件支持
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 社区资源
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 Glossary
  13. 13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

10 Power Supply Recommendations

The VDD capacitor recommended value is 100 nF to ensure high-phase margin of the internal 5-V regulator and it should be placed close to VDD pin and GND pins to minimize the series resistance and inductance.

The VDD pin provides a regulated 5-V output but it is not intended as a supply for external load. Do not supply VDD pin with external voltage source (for example the auxiliary winding of flyback converter).

Always keep GND pin 1 and GND pin 2 connected together with the shortest possible connection.