1. Have 3 phase ac input with neutral, where each phase voltage goes from, 85V-600Vacrms
2. Need output at 5V/500mA
3. I was checking it: https://www.st.com/resource/en/a...
its page 8 has this, that is to make dc from 3 phase
I checked ST/s VIPER267K, which has BVDSS of 1050Vdc .
But at full 600V each phase, the output dc after diode, can go upto 1100V (simulated on mulltim)
page 22 shows external fet operation, but again limited to 1200V, very close, so cant use
5. Anyone have experience in this low power application where size/size constraints? Any reference design?
ST Viper could have used without transformer(its sealed application). but again breakdown voltage too close.