Thanks for the replies, the issue we're having is that the polarity switching must happen "before" the voltage step down. So the circuitry must be able to work independent of the polarity. See below
______________________ | | ________ (+28)------| |-----(+24)-----| | | Voltage Regulation | | Motor | CW Rotation (Gnd)------| |-----(Gnd)-----|-------| | | ----------------------
______________________ | | ________ (Gnd)------| |-----(Gnd)-----| | | Voltage Regulation | | Motor | CCW Rotation (+28)------| |-----(+24)-----|-------|
We need to place the voltage regulation circuit "between" the 28V and the motor knowing that the 28V may switch in order to switch the direction of the motor. Does this make sense?
Again, any idea would be great. We're trying to keep the number of parts to a minumum (due to PCB size requirements) thats why I thought zeners would be the easiest.
Thanks again, Lucas.