PMP20686: Upside-Down Buck Reference Design

Hello,

This circuit is essentially a negative input buck converter. Instead of traditional buck converter where the input ground and output ground are the same node, in this topology the positive input and positive output are the same node. I have attached one paper on this. You can also reference the UCC28880 datasheet page 18+ for more information.

Thanks,

RyanThe Parallel Universe of Negative Input Voltages.pdf