PMP23338: Need Guidance on Modifying PMP23338 (Totem Pole PFC) Reference Design for Custom 7kW SiC-Based Configuration

Tool/software:

Hi TI Team and Experts,

I’m designing a single-phase totem pole PFC circuit with the following specifications:

• Input: 220VAC

• Target Output: 400VDC

• Power Rating: 7kW

• Reference Design: PMP23338

• Topology:

  • High-frequency switches: Four SiC MOSFETs (two pairs in parallel)

  • Low-frequency switches: Two SiC MOSFETs

• Key Components:

  • Power inductor: 200 µH

  • Switching frequency: 65 kHz

I’ve imported the PMP23338 project into Code Composer Studio (CCS), but need assistance with three critical issues:

1. Parameter Adaptation:
   How should I modify the project parameters (e.g., inductor value, switching frequency, MOSFET configuration, power stage scaling) to align with my 7kW custom design?

2. Configuration File Clarification:
   I’m unable to fully interpret all parameters in main.syscfg. Could you explain the purpose of key registers (e.g., PWM, ADC, current/power limits, protection thresholds) relevant to high-power totem pole PFC control? 

3. Missing Design Documentation:
   The reference design mentions a calculations.xlsx file for scaling factors, but I cannot locate it in the PMP23338 package. Where can I access this?

   • Note: My voltage/current sensing circuits have different scaling factors due to the 7kW power level, and I need to validate them.

Supporting Information:

• Schematic and BOM are available upon request.

• Controller: TMS320F280049C

• Critical Design Challenge: Scaling PMP23338 (lower power) to 7kW with parallel SiC MOSFETs.

Thank you for your expertise!

Best regards,
Han.