I'm designing a fifth generation pcb for my project and yet I stumbled across another design problem. First of all, the circuit and all components are enclosed from the environment and users (because non-isolated) for safety.
My design would rectify the mains (European 230V AC) to a DC voltage and after that some buck-switching controller would do the job. The only problem here is, that there aren't such IC's, that would accept the ~350V DC voltage. After looking at DC-DC Converters from LCSC, I knew there are those Switching Controllers, but after a while - all the datasheets feature an isolation transformer to step-down the voltage.
I planning to use a non-isolated supply, because it doesn't require a custom transformer to build, just an inductor that I'll even find at LCSC.
Power output requirement: 5V at 150mA (maximum), to power an ATmega168P with some SPI/I2C chips.
In what direction should I search to find some information related to this kind of SMPS? I'll be really grateful for all advices I can get from others, more experienced engineers.