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 +=20
>inductor topology, you will need a transformer or autotransformer. You=20
>can still use a single power device.
>
>Even if you lowered the switching frequency so the "off" time is still=20
>in a reasonable range for the inductor/diode/switch, most switcher=20
>chips won't go to the extreme duty cycle you'd need (98%+) to make a=20
>simple inductor work. I usually figure any voltage ratio higher than=20
>1:5 needs a transformer unless the current requirements are very very=20
>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=20
>cheap inductors. You could wind a second layer on top of a typical=20
>"spool" inductor and you'd have yourself a fine little transformer=20
>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=20
>primary. And keep fingers crossed about high voltage breakdown.
>
>I've also salvaged transformers from electric bug swatters and photo=20
>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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