TIDT435 February 2025
2.3 Thermal Images
Figure 2-7 shows the test setup of PMP41139 converter. Thermal images at 120A and 250A output current are shown in Figure 2-8 and Figure 2-9. 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: 800Vin, 13.5Vout, room temperature, 20°C degree liquid coolant.
Figure 2-7 Thermal Setup
Figure 2-8 Thermal Image at 120A
Figure 2-9 Thermal Image at 250AThe 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-SHB topology. PMP41139 and PMP41078 use the same magnetics, so please refer to PMP41078 reference design to check the thermal performance of transformer and choke.