TIDT239A April   2021  – July 2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Dimensions
  3. 3Testing and Results
    1. 3.1 Switching Frequency
    2. 3.2 Standby Power Consumption
    3. 3.3 Tiny Load Power Consumption
    4. 3.4 Average and 10% Load Efficiency
    5. 3.5 Efficiency Graphs
    6. 3.6 Thermal Images
    7. 3.7 Bode Plots
    8. 3.8 EMI
  4. 4Waveforms
    1. 4.1 Switching
    2. 4.2 Output Voltage Ripple
    3. 4.3 Load Transients
    4. 4.4 Voltage Transitions
      1.      Trademarks
  5. 5Revision History

1 Description

This reference design is a low-cost, high-density USB adapter that uses the UCC28782 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-, 15-, 9-, and 5-V output voltage and 3 A. This design reaches a peak efficiency of 93.4%. The average efficiency and standby power levels are designed to meet DoE level VI and CoC Tier 2 limits. The compact design has dimensions of 44 mm × 54 mm × 20 mm (48cc open frame).

GUID-20210403-CA0I-5SRP-KZC7-HHTXJNLLT6WC-low.jpgFigure 1-1 Top View of Assembly
GUID-20210403-CA0I-QRZW-S3CQ-DHZBCHKSDVQW-low.jpgFigure 1-3 Angle View of Assembly
GUID-20210403-CA0I-SLWM-CC5J-T8NML69QL22N-low.jpgFigure 1-2 Bottom View of Assembly
GUID-20210403-CA0I-HCNG-RFQR-HP0M7MGG8RLQ-low.jpgFigure 1-4 Angle View of Assembly