I have an application where I need to drive 2 piezoactuators in a push-pull arrangement (voltage 180deg out of phase with each other) where the charge/discharge time is about 50 microseconds and the actuation is not periodic but on-demand and occurs at least 1 time/second. After some very useful help here I started using a proper driver for high side and low side power switching, and everything works when cycled continuously with a square wave, but there are problems when the time domain increases and I try to keep the voltages static. I mirrored the circuit below to drive each stack actuator.
When Vcc and the source voltage are applied, HO defaults to ~3/5-4/5s of Vcc while Hin=0V (Vcc=15V, HO is ~9V in one side, ~12V in the other side), and this seems to allow the voltage at the load/piezos to match HO.
Is there anyway to keep HO=0V on power-up?