TIDT246 September   2021

 

  1. 1Description
  2. 2Test Prerequisites
    1. 2.1 Voltage and Current Requirements
    2. 2.2 Required Equipment
  3. 3Testing and Results
    1. 3.1 Efficiency and Power Dissipation Graphs
    2. 3.2 Efficiency and Power Dissipation Data
    3. 3.3 Thermal Performance
    4. 3.4 Bode Plot
    5. 3.5 Voltage Regulation
  4. 4Waveforms
    1. 4.1 Switching
    2. 4.2 Output Voltage Ripple
    3. 4.3 Start-up

4.3 Start-up

The start-up behavior of each converter is shown in the following figures. The boost converter start-up was measured on controller enable, the controller was disabled by shorting the COMP pin to GND. VOUT is shown in yellow.

GUID-20210721-CA0I-LN2N-1KTD-TP7HKPMLQGTP-low.pngFigure 4-12 Boost Converter Start-up, 13.5 VIN, Maximum Load

For the LLC converter, a 3-W output (yellow) and a 1-W output (blue) are shown.

GUID-20210720-CA0I-MN7F-NTHV-JP2ZK7BSQ2Z6-low.png Figure 4-13 LLC Converter Start-up, 30 VIN, No Load
GUID-20210720-CA0I-VNGC-6R2G-9KPCHHRGGZR4-low.png Figure 4-14 LLC Converter Start-up, 30 VIN, 50% Load
GUID-20210720-CA0I-G8DX-HF4N-3HGJCNCPVF7L-low.png Figure 4-15 LLC Converter Start-up, 30 VIN, Maximum Load