The load is a piezo ultrasonic transducer, so, I choose to model it with Butterworth-Van Dyke model, ie., C2//(R10-L10-C3). The real value is picked up from Murata's datasheet.
The goal of my design is to drive transducer with high voltage (~200V) and fast slew rate pulse, while the output power is not high, several Watt.
Because the input signal is pulse, which inherently looks like PWM, so the class d circuit is my first choice. And the final design would be full bridge driver to further lift the power.
When I tried to design this circuit, I didn't find any class d power amplifier ic which could support such high voltage. The catelogue I searched is audio class d amplifer. Maybe I missed something, and went the wrong way. However, those audio power amplifier (Class AB or class D) are designed for high power, not for high voltage.
Is there any off-the-shelf product for this design? I noticed tons of half bridge MOSFET driver for power supply, and I'm not sure if those drivers are suitable here.
Anyway, thanks advance!!!
The question for circuit now is when I switch on low side mosfet, the high side mosfet will errornous switch on, which waste lots of power and slow the discharge process. And I haven't find a way to eliminate it.