SLUAAB9A March   2021  – December 2021 UCC25800-Q1

1.   Trademarks
2. 1 Introduction
3. 2 Open-Loop LLC Converter Operation Principle
4. 3 Primary-side and Secondary-side Resonant Configurations
5. 4 Rectification Methods
   1. 4.1 One Resonant Capacitor, Voltage Doubler
   2. 4.2 Two Resonant Capacitors, Voltage Doubler
   3. 4.3 One Resonant Capacitor, Full-wave Rectifier
6. 5  LLC Transformer Design Steps
   1. 5.1 Transformer Turns Ratio Selection
   2. 5.2 Transformer Volt-second Rating Calculation
   3. 5.3 Transformer Construction
   4. 5.4 Transformer Winding Selection
   5. 5.5 Transformer Inductance
      1. 5.5.1 Leakage inductance
      2. 5.5.2 Magnetizing inductance
   6. 5.6 Transformer Selections
7. 6 Negative Voltage Generation
   1. 6.1 Using a Zener Diode
   2. 6.2 Using a Shunt Regulator
   3. 6.3 Using a Shunt Regulator and Linear Regulator
8. 7 Multiple-output Design
   1. 7.1 One UCC25800-Q1 Drives Each Output
   2. 7.2 Transformer With Multiple Secondary-side Windings
   3. 7.3 Multiple Transformers
9. 8 EMI Performance
   1. 8.1 EMI Performance With Standalone Converter
   2. 8.2 EMI performance with an inverter power stage
10. 9 Common-Mode Transient Immunity (CMTI)
11. 10Summary
12. 11Revision History