TIDT303 August   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
  5. 2Testing and Results
    1. 2.1 Efficiency and Voltage Regulation
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 EMI
  6. 3Waveforms
    1. 3.1 Start-Up Sequence
    2. 3.2 Switching
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients

3.2 Switching

FET and diode stress is shown in the following switching waveforms at 265-VAC input.

GUID-20220815-SS0I-BMJJ-K4W3-J8VFSJHXX1CZ-low.jpg
Ch2 (blue): Q1 switch node voltage (100 V/div) - full bandwidth
Timebase: 2 μs/div
Figure 3-3 Voltage Stress for Primary MOSFET
GUID-20220815-SS0I-0NMK-NC96-WNVPSPG69NBM-low.jpg
Ch2 (blue): Diode voltage (20 V/div) - full bandwidth
Timebase: 8 μs/div
Figure 3-4 Voltage Stress for Output Diode