I have built a circuit that can drive a 3.3v AC output at a few hundred mA. The wave has a frequency of 150Khz. I want to step this up to 60-90v at ~0.5 Watts to drive an ultrasonic piezo. However, I am having difficulty finding a transformer. From what I understand, I am looking for one with a coil ratio between 1:20 and 1:30, and a relatively small VA. I would also like the transformer to be as small as possible (low height is more important than small footprint). I have looked on common electrical supply house websites like Digikey, but their filters aren't all that helpful. Coil ratio is never a filter option, and anytime I find one that I think might work, it is made to operate at 60Hz. Also, when I search "1:30," I get results for current transformers, and I don't believe that these are suitable for my application. I would greatly appreciate some guidance on how to search for a transformer and possibly some suggested devices.
Secondly, I am not positive that I am on the right track for this project. The circuit that I created is a class E amplifier. Should I be feeding Vcc 60-90v DC (by using a flyback converter, for instance) rather than throwing a transformer on the output? The idea is to prioritize making the circuit small with some consideration for efficiency. Thanks for the help!