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In Reply to: RE: Q:DN2540 CCS protection diodes posted by deathtube 667 on January 05, 2017 at 18:06:34
Nikos Salas uses 12V zeners with the DN2540s in the CCS in his HPHV shunt regulator pretty much as your diode strings, but with the difference that each of the zeners is on the opposite end of the gate stop resistor from the gate of the MOSFET. It probably doesn't make any practical difference, but I would consider this better practice, as it isolates the gate from anything that could send RF noise to the active device.
As already noted, you don't need back-to-back zeners.
Alex
Follow Ups:
You need back to back zeners if you battery bias to use a higher set resistance.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
A gate stop resistor and a 12V zener.
Thanks.
dt 667
That's weird! I would have posted the Salas schematic but remembered that on this forum you can't upload files. I had forgotten I'd put that up on my own website...
Alex
Yes, you can upload files. There's an Upload Image dialog in the reply box.
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OK, that's good to know.
Alex
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