I have designed 12V, 1Amp (using maximum load 250mA) with 230V to 480VAC.
I have see frontend section is started burning including the cable connectors in some case. Th efailure rate is 30%.
I am using TNY278 device in this design with stak MOSFET.
Can you please suggest if TNY278 can take care of this high voltages.
I am using 1N4007 diodes for bridge rectifier for 3 phase. Should I add two diode inseris to increase the reverse break voltage?