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From: liz@poppyrecords.invalid.invalid (Liz Tuddenham)
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Thu, 22 May 2025 09:44:30 +0100
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john larkin <jl@glen--canyon.com> wrote:

[...]
> Going from 1KV to 3.3v has interesting possibilities. The easy way is
> a resistor and a zener. Efficiency about 0.3%.

Roughly 1W dissipation per mA , so if the current requirement isn't too
high, that is probably the most straightforward system with very little
to go wrong. 


> More efficient would be a resistor and a zener and then a buck
> switcher. 5% maybe.

That's a lot of extra complication for very little improvement, the
resistor still has to carry the full load current.

For a cult market you could use an 807 and tap the 3.3v off the cathode
bias resistor.  (or better still, rectify the heater supply and use a
linear regulator but don't tell the customer).


-- 
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk