what maxim called an "upside down" or inverted boost, ti (probablydepending on author) calls a negative boost:
http://www.ti.com/lit/an/slyt516/slyt516.pdf
"1. The converter should have external compensation to
accommodate the different control algorithm associated
with the boost converter, which will be discussed later."
cout isn't doing anything very useful here, needs to be configured as a normal negative boost converter:
