dc/dc startup

https://www.dropbox.com/scl/fi/3hyvmc3mkvhrk6rc8dt72/P970_DC-DC.jpg?rlkey=npgerceq4t191hnjfd0907v6u&raw=1

That makes two isolated 56-volt power supplies. But  the problem is
how to start it up.

I could just slam on the square wave drives and let the TI chip
current limit until the caps charge up. That might work.

I was thiking I could start the two half-bridges with in-phase square
waves and then slowly slide them out to 180 degrees. My FPGA kids
could do that. That would be a nuisance to Spice.

We did a similar supply a while back with discrete fets, no current
limits. Startup made 300 amp spikes that made all sorts of problems.