TIDT339 june   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Testing Conditions
    4. 1.4 Considerations
    5. 1.5 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs and Data
      1. 2.1.1 Efficiency Graph: Light Load Performance
      2. 2.1.2 Efficiency Graph: Available Output Power Versus Input Power
      3. 2.1.3 Efficiency Graph: Full Load Performance
      4. 2.1.4 Efficiency Data
        1.       17
        2.       18
        3.       19
    2. 2.2 Thermal Images
    3. 2.3 Static Output Voltage Variation versus Load
      1. 2.3.1 Light Load Range
      2. 2.3.2 Light to Full Load Range
    4. 2.4 EMI Measurement According to EN55022 Class-B Quasi-Peak Limits
  7. 3Waveforms
    1. 3.1 Switching on Q1 (VDS Voltage) at Full Load
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up and Shutdown Sequence
      1. 3.4.1 Start-Up Sequence
        1. 3.4.1.1 Load Current 0 A
        2. 3.4.1.2 Load Current 1.7 A
      2. 3.4.2 Shutdown Sequence

3.4.1.2 Load Current 1.7 A

  • C1: Input AC voltage (200 V/div, 100 ms/div, DC coupling)
  • C3: Output voltage (5 V/div, DC coupling)
GUID-20230622-SS0I-1N5Z-MP4R-5GKWNQH4DFQ1-low.png Figure 3-8 Start-Up With 1.7-A Load (100 ms/div)

            
Figure 3-9 is the same measurement as in Figure 3-8 but with smaller time division (20 ms/div).

            

                
                GUID-20230622-SS0I-S3BS-XSJN-FZWDG0HQTX2R-low.png
            Figure 3-9 Start-Up With 1.7-A Load (20
                    ms/div)