ZHCSCP2 July   2014 UCC28880

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Startup Operation
      2. 7.4.2 Feedback and Voltage Control Loop
      3. 7.4.3 PWM Controller
      4. 7.4.4 Current Limit
      5. 7.4.5 Inductor Current Runaway Protection
      6. 7.4.6 Over-Temperature Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 12-V, 100-mA Low-Side Buck Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Stage (RF, D2, D3, C1, C2, L2)
          2. 8.2.1.2.2 Regulator Capacitor (CVDD)
          3. 8.2.1.2.3 Freewheeling Diode (D1)
          4. 8.2.1.2.4 Inductor (L1)
          5. 8.2.1.2.5 Output Capacitor (CL)
          6. 8.2.1.2.6 Load Resistor (RL)
          7. 8.2.1.2.7 Feedback Path (Q1, RFB1, RFB2)
        3. 8.2.1.3 Application Curves
      2. 8.2.2 12-V, 100-mA, High-Side Buck Converter
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Feedback path (CFB, RFB1 and RFB2) and Load Resistor (RL)
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Additional UCC28880 Application Topologies
        1. 8.2.3.1 Low-Side Buck and LED Driver - Direct Feedback (level-shifted)
        2. 8.2.3.2 12-V, 100-mA High-Side Buck Converter
        3. 8.2.3.3 Non-Isolated, Low-Side Buck-Boost Converter
        4. 8.2.3.4 9.5 Non-Isolated, High-Side Buck-Boost Converter
        5. 8.2.3.5 9.6 Non-Isolated Flyback Converter
        6. 8.2.3.6 Isolated Flyback Converter
  9. 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 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 术语表
  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

9 Power Supply Recommendations

The VDD capacitor recommended value is 100 nF to ensure high phase margin of the internal 5V- 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 5V 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.