The Application Note SNOA968A–August 2017–Revised October 2017 relating to LPV821 shows in Figure 5 an AC/DC converter supplying power to the amplifier.
However the core of the problem in these kinds of 'no neutral' environment applications is providing the power to the electronics. In this figure an AC/DC converter is shown with a single input. In fact this will not work and it appears that there is no way to implement an AC/DC converter in this context without a neutral wire.
Is there a mistake on this diagram? where is the other AC input to the AC/DC converter supposed two come from?
Has this reference design ever been built and if so how did it work given the schematic?
I am trying to implement exactly the example provided in Figure 5 but have found no solutions anywhere for powering the electronics in a 'no neutral' environment.
Can you help?