Respected Vincenzo,
i get your points it will really help me to take decisions while designing,
i have designed circuit using tps55340, in that i want to use its internal switch and used a flyback transformer to stepup,
since my requirement is input 5V & 1A, output 900V & 2 to 5 mA, i thought imbuild switch of tps55340 just operate my transformer and i will
stepup and use few stage of voltage multiplier if required, since my i/p current requirement is within the inbuilt switch limit ( i.e. 5A) and also
the peripheral components are very less in tps55340.
2). for TPS40210, in the same way i used a flyback transformer , i designed transformer for that , i am using pot core 1408, and in the same way want to step up by transformer
or by multiplier or by both.
i spend my around 5 months in these two ics tps40210 and tps55340 , i.e so if possible guide me to design a dc dc converter from 5V to 900V at 5mA o/p current.
thank you
Yogeshwar nath