TIDT403 August   2024

 

  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 Considerations
    4. 1.4 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Performance
    4. 2.4 Bode Plots
    5. 2.5 Light Load Efficiency Optimization
    6. 2.6 Switching Frequency Choice
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Overcurrent Protection
    4. 3.4 Load Transients
    5. 3.5 Turn ON and OFF
  8. 4References
  9.   Trademarks

2.3 Thermal Performance

A thermal image is shown in Figure 2-7. Not too much thermal data can be gained from the top view due to SR card and GaN cards being vertical to main board and screwed to water-cooling heat sink.

Test condition: 400Vin, 16Vout, room temperature, 20°C degree liquid coolant.

PMP41078 Thermal Image at 180Aout, Top View Figure 2-7 Thermal Image at 180Aout, Top View

The magnetics of HV to LV DC/DC converter contain a transformer and a choke. The leakage of Transformer is used as resonant inductor in PSFB topology. Figure 2-8 is the mechanical drawing and dimensions of magnetics. Figure 2-9 shows the position of thermocouple. Figure 2-10 shows the test result when 400Vin, 16Vout, 100Aout with 20°C degree liquid coolant. Figure 2-11 shows the test result when 400Vin, 16Vout, 180Aout with 20 C degree liquid coolant.

PMP41078 Mechanical Drawing and Dimensions Figure 2-8 Mechanical Drawing and Dimensions
PMP41078 Position of Thermocouple Figure 2-9 Position of Thermocouple
PMP41078 Magnetic Thermal Performance at 100Aout Figure 2-10 Magnetic Thermal Performance at 100Aout
PMP41078 Magnetic Thermal Performance at 180Aout Figure 2-11 Magnetic Thermal Performance at 180Aout