TIDT307 October   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs 9 VIN
    2. 2.2 Efficiency Data
    3. 2.3 Output Voltage Regulation (9 VIN)
    4. 2.4 Thermal Images
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Primary Side
      2. 3.1.2 Secondary Side
    2. 3.2 Output Voltage Ripple
    3. 3.3 Start-Up Sequence

Description

This reference design features an LLC converter controlled by the UCC25800-Q1 (open-loop LLC transformer driver for isolated bias supplies), operating with 9 V, generating three output voltages of 9.0 V with a maximum load current of 50 mA each. An air core transformer was used to avoid the core saturation in the presence of a strong external magnetic field.