I've been looking at Piezo drivers lately. They are effectively 0->100v output amplifiers with 0->10v input. Which can source ~60mA, at a few KHz.
The drivers I've seen mostly use high voltage opamps on the output (Apex PA41s for example). However those opamps are very expensive. Is it possible to use a low voltage opamp to provide the feedback to a high voltage MOSFET something like the following schematic?
Or is there some other reason to favor a integrated solution?