Re: 200V at 10mA

On Thu, 22 Aug 2024 10:27:43 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:

john larkin <jlarkin_highland_tech> wrote:

On Thu, 22 Aug 2024 10:36:27 +0100, piglet <erichpwagner@hotmail.com>
wrote:
 

On 21/08/2024 17:39, Edward Rawde wrote:

SYMATTR InstName C5

 
If you want to stick with that way-over-complex design you could look
into versapac 6 windings coupled inductors.
 
I would not even try that circuit. Better to redesign to use either a
single inductor or a dual coupled inductor like DRQ127 series. if
necessary follow with a cockcroft-walton multiplying rectifier.
 
UC3843 control chip would be ideal, cheap, reliable, easy to use,
multisourced.
 
piglet

 
I like the auto-flyback circuit, flyback drive into the center tap of
a DRQ127. Then maybe a voltage doubler to harvest the p-p swing.
 
And LTC3803 rocks.
 
https://www.dropbox.com/scl/fi/8jwi35owo41lfmonc8y92/LTC3803.jpg?rlkey=l3thy5h4533sxpd152ve24c26&raw=1
 
 

>
Very slick part but LT/AD usually too luxurious pricewise for me. The
UC384x is slow and old but tenth the cost. I like the 5V reference output
can often support a low power MCU etc

True about the price. Our stuff isn't very price sensitive.

TI has some great little switchers lately.  We're paying 21 cents for
the TPS562208DDCT spread-spectrum synchronous buck switcher.

I wonder if it would be practical to use one of those to make the
12/200 volt converter. That's just possible. Let's play with that
idea.

Unfortunately, it's a nuisance to plug the TI models into LT Spice.