I would like to know if there are monolithic switcher ICs for flyback topology to achieve +5kV DC (5 Watts) from standard single phase AC 230V rms. Most of the sites i checked, give upto 1000 V design (LT 8304) . Thanks .
If you can divide down the o/p volts and have enough power to run an opto or other feedback loop - then you can run most any off the shelf flyback controller ...
If you can divide down the o/p volts and have enough power to run an opto or other feedback loop - then you can run most any off the shelf flyback controller ...
"Flyback" and "open loop" is not a good idea.
With low (no) load the output voltage will go unwantedly high ... maybe until a device breaks down in overvoltage.
I recommend to read through some SMPS basics for different topologies.
open loop means you have no control of Vout, so if you design for a given load and that load is removed the volts will go up to unknown levels - similarly - if you put desired load on you have no idea what actual Vout is ...