SLUS544G September   2003  – April 2017 UCC28220 , UCC28221

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 VDD
      2. 8.3.2 Reference
      3. 8.3.3 Oscillator Operation and Maximum Duty Cycle Setpoint
      4. 8.3.4 Soft Start
      5. 8.3.5 Current Sense
      6. 8.3.6 Output Drivers
    4. 8.4 Device Functional Modes
      1. 8.4.1 Line Overvoltage and Undervoltage
      2. 8.4.2 Start-Up JFET Section
      3. 8.4.3 Slope Compensation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Overvoltage Protection and Undervoltage Lockout
        2. 9.2.2.2 Peak Current Limit
        3. 9.2.2.3 Current Sense Transformer Reset Resistor (T1 and T2)
        4. 9.2.2.4 Oscillator and Maximum Duty Cycle Clamp
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|16
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10 Power Supply Recommendations

The VDD power terminal for the device requires the placement of electrolytic capacitor as energy storage capacitor. And requires the placement of low-ESR noise decoupling capacitance as directly as possible from the VDD terminal to the VSS terminal, ceramic capacitors with stable dielectric characteristics over temperature are recommended, such as X7R or better. TI recommends a 1-µF, 50-V e-capacitor.