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UCC28700: ucc28700

Part Number: UCC28700
Other Parts Discussed in Thread: UCC28780

SLUC408B was a spreadsheet-based calculation for UCC28700 series.

It is very helpful albeit with caveats they have.

But I have made it work in an effective manner ( with lots of help from Pete Goudreau of course back when...)

But now, I need to reuse for a new design & I find same old issues cropping up- for which Pete has insight but I do not.

I have successfully unlocked the cells.

For example, some lines are hidden rows are important to modify. I found no way to get them to appear.  Rows 65 through 69 I think.

There is a variable "vinripple1" I find it nowhere calculated. It may need to be changed as well.

cld anyone just flush the issues & put it back in the tools section of the UCC28700 even if it old.

In fact, I  find no other solution for making a very compact isolated bias supply! I mean very small...got us an IP!

A curiosity here: all flybacks are flybacks...so if I calculate Primary inductance from this tool, for a given set of conditions, would you not think UCC28780 spreadsheet comes up with the same Lpm?

I suspect it does not. & that has me a bit concerned. We are using both for different designs...but this is just a mote about consistency in formulas at some deep level.

Won't you think so?

r