I Rec'd the 6HC and in the interim thought to myself why could'nt I just run 32V to the VIN and power my switched peripherals using and off board power supply. Tie +24 PS to the + of the peripherals (several pumps) and the - to the 6HC ground and just use a low side drive from the 6HC.
We'll I wired it up and it works, but theres two issues. First, regardless of 6HC IO state, the IO LED is on 2nd the V differential between the PS and the 6HC. Second, during power down, the 6HC discharges at a different rate than the peripheral power supply which causes the pumps to surge momentarily. These are annoyances but the practical functionality is sound. Is there any other reason such as potential damage or component failure from doing this?
Im just curious if its ok to run things on the bench like this before I button things up. When I do button things up I'll use FET drivers for end use. I did patch in a FET driver board to make sure everything operated well, which it did without the above annoyances, but the board is opto isolated and switching freq is limited to 1K. Im testing pump performance at the 16-20khz. Once I have things sorted ill use non isolated gate drive FETs.
Thanks
Wayne