An N-channel on the high side needs its gate several volts above its source to turn on fully. From the same 24 V rail you can’t get the gate above 24 V, so the source can only rise to whatever the gate gets minus the threshold.
An N-channel on the high side needs its gate several volts above its source to turn on fully. From the same 24 V rail you can’t get the gate above 24 V, so the source can only rise to whatever the gate gets minus the threshold.