I am about to embark on my second Maida regulator design. I am a bit concerned, though. I am unable to find a pass device rated for a voltage greater than the raw DC supply voltage. Is this only a concern if you want the supply to survive a short circuit? I am willing to live with destruction of the components if I am dumb enough to short the output.
I am planning on making a -500V regulator with about -560V raw DC.
I am planning on making a -500V regulator with about -560V raw DC.
I don't plan on having any downstream capacitance, so I guess I'll try a zener across the pass device and see how reliable that is. With minimal capacitance there won't be much pinning the output to ground at power-up or a bunch of energy to bleed off at power-down. Hopefully, the Zener won't see any huge current surges.
I've also thought about two pass devices in series. Dropout voltage would be higher, though.
I just wish there was an 800V p-channel FET.
I've also thought about two pass devices in series. Dropout voltage would be higher, though.
I just wish there was an 800V p-channel FET.
Colt45 said:if you have a seperate winding for the -500v, just regulate the high (ground) side... then you can use Nch stuff.
As recommended in "The Art of Electronics".
If you have to do the high-side there are a lot of HV MOSFETs.
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