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Low quiescent/ standby boost regulator 3.3-500V

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Amper:
We have gone through this already, at the size i need home brewing is not possible, the inductor we are looking at here is a maximum 5x5mm footprint and there is a height limit as well. Also as said before i have problems with losses at those high frequencies and high winding count, the capacitance at this voltage is not to underestimate at 1MHz and above.

Amper:
Ans another update:

Sometimes its a nice idea to ave a look at what others have dome and luckily some people have reverse engineered commercial equipment already.



Sadly german but you may still see how it works, a single stage boost converter but controlled by the microcontroller and voltage sensing decoupled by diodes to reduce the discharge while the voltage is still there. This is of cause only possible by a micro "looking after" the voltage every few seconds or minutes by pulsing the boost converter a few times but reduces the total current enough to power the entire device from a single AA sized lithium battery for years (over an entire decade) constantly holding 500V of tube voltage.

EmmanuelFaure:

--- Quote from: Amper on July 16, 2019, 07:51:39 pm ---Sometimes its a nice idea to ave a look at what others have dome
--- End quote ---

You say?


--- Quote from: Amper on July 16, 2019, 07:51:39 pm ---[...] a single stage boost converter but controlled by the microcontroller and voltage sensing decoupled by diodes to reduce the discharge while the voltage is still there. This is of cause only possible by a micro "looking after" the voltage every few seconds or minutes by pulsing the boost converter a few times but reduces the total current enough to power the entire device from a single AA sized lithium battery for years (over an entire decade) constantly holding 500V of tube voltage.
--- End quote ---

LTC3525 does that without any µC :
https://www.analog.com/media/en/technical-documentation/data-sheets/3525fc.pdf

Iq = 7µA with a 135mAH cell => Autonomy ~ 2 years.

Amper:
But doesnt this one have an internal synchonous buck and no seperate FB pin? I dont see how i could use it in that topology.

SiliconWizard:
Yeah. Looks like it's running in circles a bit. I think we already have been through the idea of using a conventional boost converter to generate a high voltage...

Regarding the commercial equipment you mentioned, I'm not completely sure I got how it's generating the high voltage. Care to share a simplified schematic?

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