Hello,
1. For the PFC at this power level you might consider designing interleaved PFC. They can be designed for 90 to 95% max load efficiency. This can be accomplished using the UCC28070 interleaved PFC controller.
The following link will get you to product folders for UCC28070 PFC controller. There you will find application notes and design tools to design your PFC front end. If you have questions regarding the UCC28070 controller, please repost in the e2e with UCC28070 in the thread title so the appropriate applications engineer can answer your questions.
https://www.ti.com/product/UCC28070
2. Above 1 kW for the step down DC to DC converter a phase shifted full bridge (PSFB) is a popular choice. The PSFB converters can be designed for up to 95% efficiency.
If you decide to design a PSFB for your 1.5 kW, you could use the UCC28950 PSFB controller. The following link will get you to product folder for this PSFB controller. There you will find application notes and design tools to design your PSFB. If you have questions regarding this controller please repost in the e2e with the UCC28950 part number in the thread title so the appropriate applications engineer can answer your questions.
https://www.ti.com/product/UCC28950
3. There is a 3rd option. Maybe there is a reference design that was done by power supply design services that meets or is close to your design specifications already. The following link will bring you to the Texas Instruments reference design library. You just enter your input and output power requirements and hit search. The tool will search the reference design library and will find designs that meet or come close to meeting your design requirement needs.
https://www.ti.com/reference-designs/index.html
https://www.ti.com/reference-designs/index.html
If you have any questions regarding the reference designs. Please repost in the e2e with the reference design number in the title to so the appropriate applications engineer and/or reference designer can answer your questions.
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Regards,
