@rad400 posted:Thanks for the additional information and this could be a way to resolve the problem of replacing bad MOSFETs when the variable channels are used as fixed channels. If the two variable channels are always used as fixed channels, and a MOSFET goes bad, any issue of just jumping the TVS so now you are just getting full transformer voltage at the output of the TIU channel?
I would not recommend that. The TVS was there in an attempt to protect against voltage spikes. It's not there as a primary current path. If you are having events that would kill the channels (derailments, overloads, shorts, inductive kickback spike events) that caused the original failure and then now passing primary current through a path meant to be for protection seems like a really bad idea.
Ideally, just use passive mode and external inductive choke and bypass the entire power section. and any power going through the TIU.
