TIDT256A March   2022  – March 2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 LM5156-Q1
      1. 1.1.1 Loading LM5156-Q1
      2. 1.1.2 LM5156-Q1 SEPIC Bode Loop Testing
    2. 1.2 Loading UCC14240-Q1
    3. 1.3 UCC5870-Q1 and UCC5870-Q1 EVM GUI
    4. 1.4 Voltage and Current Requirements
    5. 1.5 Required Equipment
    6. 1.6 Considerations
    7. 1.7 Dimensions
  5. 2Testing and Results
    1. 2.1 SEPIC Efficiency Graphs
    2. 2.2 SEPIC Efficiency Data
    3. 2.3 SEPIC Bode Plots
    4. 2.4 Thermal Images
  6. 3Waveforms
    1. 3.1 SEPIC Switching
    2. 3.2 SEPIC Output Voltage Ripple
    3. 3.3 SEPIC Load Transients
    4. 3.4 SEPIC Start-Up Sequence
    5. 3.5 Isolated Bias Supply Start Up and Shutdown
    6. 3.6 Isolated Gate Drive

SEPIC Switching

Switching behavior is shown in the following figures.

GUID-20220126-SS0I-DLJC-JZMD-SC10JKKJQBV9-low.jpgFigure 3-1 Switching at 18-VIN Q1 Drain Full Load at 445 kHz Showing Only 1 Pulse
GUID-20220126-SS0I-Z8ZD-9BNJ-HQPXVWDVBWBH-low.jpgFigure 3-3 Switching at 42-VIN D1 Anode Full Load at 445 kHz Showing 2 Cycles
GUID-20220126-SS0I-V60K-BNFV-S59DKRN7GTGD-low.jpgFigure 3-2 Switching at 18-VIN Q1 Drain Full Load at 445 kHz Showing 22 Cycles
GUID-20220126-SS0I-NNTF-1MHR-S24PCVHLHVBD-low.jpgFigure 3-4 Switching 42-VIN Q1 Drain Full Load at 445 kHz Showing Two Cycles