And yet another link. This PSU works from an input supply of 100V RMS to 250V RMS and produces 170V DC output but only at 600 mA. Scaling it up to 1.2A would be no big deal though. I am not saying at the moment that this architecture is necessarily the optimum; it is just an example:
https://www.onsemi.com/pub_link/Collateral/DN06014-D.PDF
https://www.onsemi.com/pub_link/Collateral/DN06014-D.PDF
Last edited: