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DC/DC DPA425 high voltage output and regulation

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asrock70

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I need make from DC input voltage high voltage for charging capacitor 4uF, max output power 20W and very low usage rate.
And min. tree switchable output voltage 100V, 150V and 200V

I look on DPA425, transformer design for 200V output 4T/32T. I thing this is not problem.
Feedback is over bias and zener diode VR1. My idea for tree voltage level is
Replace zener VR1 with Tl431 and for 200V setting as 22V , for 100V as 11V

It can work or it is nonsense?

DPA425.png
 

I dont know what is max voltage on drain of fet inside dpaswitch.
Be careful your reflected voltage + spike voltage + input voltage does not go over this level.
But in theory a flyback for that is feasiable yes.
Be wary of the amount of ringing voltage across the secondary diode......the leakage inductance referred to the secondary will be much because your NS>>NP.
You may well need to interleave wind the transformer.
Di d the powerint.com PIXIS design software say anything about the suitability of the dpaswitch?
I havent yet been through the dpaswitch datasheet here, sorry.
You know power.com have their own forum for their kit?
 

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