Other Parts Discussed in Thread: UCC256404, UCC25640EVM-020
Some of the UCC256404 literature shows the resonant network's Cr as a capacitive divider with the upper capacitor from +400V to the junction and a lower capacitor from the junction to GND. I haven't see this method used on most other QR Converters I have looked at.
I doubt it would be a capacitive divider anyway.
The Excel Spreadsheet UCC25640x Design Calculator Rev1.0 show's the more typical single capacitor method on its schematic page (Same as on the "schematic-less" UCC256404 data sheet).
The UCC25640EVM-020 Evaluation Module contains full schematics which do show the upper and lower capacitors.
For proper UCC256404 operation, based upon the Excel Spreadsheet UCC25640x Design Calculator outputs, what should I use?