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DC-DC 3v to 400v step up
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JJalling:

--- Quote from: blueskull on July 09, 2019, 02:11:14 am ---How small do you need it to be? I can get it done in less than 1cm*1cm*3mm.

--- End quote ---
Can you suggest some papers or books to read, to be able to achieve this size? Maybe even component suggestions.

BR Jonas
David Hess:
5 milliamps at 400 volts is 2 watts.  At that power level, an inverter may be a better choice than a flyback converter.
David Hess:

--- Quote from: blueskull on July 10, 2019, 01:56:32 am ---
--- Quote from: David Hess on July 10, 2019, 01:54:35 am ---5 milliamps at 400 volts is 2 watts.  At that power level, an inverter may be a better choice than a flyback converter.
--- End quote ---

Presumably you mean CCFL inverter. When is the last time you saw a CCFL inverter that's in the size of 3.2mm*2.5mm?
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With that transformation ratio and power level, I doubt a flyback configuration which has to use its transformer as an energy storage element will be smaller than an inverter.

CCFL inverters typically use current driven Royer oscillators but a hard switched inverter is feasible also.

Inverters can drive capacitive multipliers just as easy as flyback converters if that is required.
floobydust:
The cost is in the transformer. Best to use something off the shelf.
It's in the realm of compact camera xenon flash DC-DC converters, LT3750, LT3751 or NCP5080. Mating TDK or Coilcraft transformer is much higher current but good.
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