We're using a MAX668 along with a BSP298 MOSFET  to get about 200V from a
16V supply for a laser rangefinder. For higher currents you'll probably
need a bigger fet. Not sure what the maximum voltage would be, we have to
limit it for the laser diode output power anyway.
A transformer would probably be a better idea if space was available.

RP

On 14 February 2018 at 06:38, Mario <electron2k4@gmail.com> wrote:

>
>
> At 18:23 2018-02-13, Bob Blick wrote:
> >Hi Mario,
> >
> >Geiger counter? Nixie clock? Photomultiplier tube?
> >
> >With that high a voltage ratio, you can't use a typical flyback +
> >inductor topology, you will need a transformer or autotransformer. You
> >can still use a single power device.
> >
> >Even if you lowered the switching frequency so the "off" time is still
> >in a reasonable range for the inductor/diode/switch, most switcher
> >chips won't go to the extreme duty cycle you'd need (98%+) to make a
> >simple inductor work. I usually figure any voltage ratio higher than
> >1:5 needs a transformer unless the current requirements are very very
> >small you can push it to 1:7. Definitely not 1:50.
> >
> >On the other hand, I have made plenty of little transformers out of
> >cheap inductors. You could wind a second layer on top of a typical
> >"spool" inductor and you'd have yourself a fine little transformer
> >with your hand-wound primary. Start with something like this:
> >
> >https://www.digikey.com/product-detail/en/bourns-inc/RLB9012-471KL/RLB
> >9012-471KL-ND/1969612
> >
> >Peel the heatshrink off it first, and use thicker wire for your
> >primary. And keep fingers crossed about high voltage breakdown.
> >
> >I've also salvaged transformers from electric bug swatters and photo
> >flashes, but they need to operate at audible frequencies.
>
> Thank you, I'll experiment along those lines. I'm also considering to
> use a PIC as "controller", also to have fun with algorithms/software
> for SMPS.
>
> With kind regards,
> Mario
>
>
> >Cheerful regards,
> >
> >Bob
> >
> >
> >
> >________________________________________
> >From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of
> Mario
> >Sent: Tuesday, February 13, 2018 2:33 AM
> >To: Microcontroller discussion list - Public.
> >Subject: [EE] 7-16V to 350-400V SMPS boost IC?
> >
> >
> >Hello,
> >could you advice me some SMPS IC (possibly with integrated MOSFET) to
> >boost from around 7-16V to around 350-400V with at least 1A average
> >input current please?
> >
> >Thank you.
> >
> >Kind regards,
> >Mario
> >
> >--
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