开云体育

Notice that Bss126 is a depletion mode, not enhancement mode, but does not matter hardly at all in this circuit. It only means Vgs will be negative, not positive.

In fact, that realization has spurred me to wonder if there is a low-power HV n-ch JFet lurking out there...... that works too.

In fact, HV BJT's in Darlington form are probably ok too for the cascodes.

rogerw

Roger?

Good morning.
The Infineon BSS126 is a nice? 600V part. Thanks.
It bugs me that? these parts are not cheap, all the stores really mark up the prices or tack on some expensive shipping.
My patience battles my frugalness. I get the occasional business trips to Tokyo. My favorite place for cheap parts is Akizuki Denshi
Many mosfets around this class are under 100 yen. I got to find small cheap one and stock up! For example:?


The 2SK3563 works but I often had to tweak the values from your suggestions to get it to work.?
I also find that the regulation is not as tight as the simulations. For example with the 2SK3563, and using your latest circuit, it works, but the regulation is not stiff, it still creeps up above the set voltage as the input voltage is +50V or more above the setting.?
I got to look through my junk pile. I may have some other MOSFET, but still in the ~ Amp Id range.
P


?

-- 
rogerw
On the Catclaw
ΜΟΛΩΝ ΛΑΒΕ

The PanDemic is over, but the DemPanic goes on.
MisDisMal is a dictator's tool of repression.