TIDT327 may   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Input Voltage Range and Current Requirements
    2. 1.2 Required Equipment
  6. 2Testing and Results
    1. 2.1 Efficiency and Power Loss Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
    5. 2.5 EMI
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Load Transients
    4. 3.4 Start-Up Sequence

3.1 Switching

The primary and secondary switch nodes of the ACF are shown in the following images at various loads.

Figure 3-22 has the following parameters:

  • Ch4 (Magenta): Q2 Switch node voltage (100 V/div), full bandwidth
  • Ch1 (Blue): Q17 SR Switch node voltage (50 V/div), full bandwidth
  • Timebase: 5 μs/div.
GUID-20230403-SS0I-M569-CVPS-WBWTXBVGHMMC-low.jpg Figure 3-1 265 VAC; 22 V at 9.5 A; ƒSW = 134 kHz; Maximum Stress on: Q1 = 570.8 V; Q17 = 98.2 V

Figure 3-2 has the following parameters:

  • Ch4 (Magenta): Q2 Switch node voltage (100 V/div), full bandwidth
  • Timebase: 5 μs/div
GUID-20230403-SS0I-N4V4-MS44-ZQC6XSDGJZQ5-low.jpg Figure 3-2 265 VAC; 22 V at 2 A; (LPM to ABM); Maximum Stress on: Q1 = 672 V

Figure 3-3 has the following parameters:

  • Ch1(blue): SR Switch node voltage (50 V/div) full bandwidth
  • Timebase: 5 μs/div
GUID-20230403-SS0I-HTNT-8FL6-FP5MRVXTPJF1-low.jpg Figure 3-3 265 VAC; 22 V at 2 A; (LPM to ABM); Maximum Stress on: Q17 = 178 V