TIDT292 June   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
    4. 1.4 Test Setup
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Power Factor and iTHD Versus Load, VAC and Frequency
      1. 2.3.1 Power Factor and iTHD Tables
    4. 2.4 Thermal Image
    5. 2.5 Bode Plots
    6. 2.6 Input AC Current Measurements: Compliance to DO160 Harmonic Limits
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 AC Waveforms (Input Voltage and Current, PFC Output Voltage)
    4. 3.4 Load Transients
    5. 3.5 Inrush Current
    6. 3.6 Start-Up Sequence
    7. 3.7 Shutdown

3.1 Switching

Switching waveforms on FETs of the PFC stage, as well primary-side FETs and sync FETs of the LLC stage, were taken by supplying the converter at 96 VAC and 115 VAC, F = 400 Hz, and full load.

GUID-20220527-SS0I-FL1J-GT6Z-LV5VBL6WZMNB-low.png Figure 3-1 Drain-Source Voltages on Q1 and Q12 (C1: Q12-Vds, C2: Q1-Vds) at 96 VAC
GUID-20220527-SS0I-L1TL-SGQR-ZKW2CKBTSLTP-low.png Figure 3-2 Drain-Source Voltages and Resonant Current at 115 VAC (C4: Q7-Vds, C3: I(L7), C2: Q5-Vds
GUID-20220527-SS0I-09MP-RZZS-Q6GWLJFS4MK2-low.png Figure 3-3 Burst Mode Waveforms (C4: Q7-Vds, C3: I(L7), C2: Q5-Vds) at 115 VAC and 200-mA Load