low power, HV-in regulator with depletion mosfet

John Larkin · 2013-06-01T17:52:53+00:00

Version 4 SHEET 1 1888 724 WIRE 768 -64 688 -64 WIRE 816 -64 768 -64 WIRE 208 48 -112 48 WIRE 352 48 304 48 WIRE 448 48 352 48 WIRE 688 48 688 -64 WIRE 688 48 528 48 WIRE 880 48 688 48 WIRE 1024 48 880 48 WIRE 1200 48 1024 48 WIRE 1392 48 1200 48 WIRE 1024 96 1024 48 WIRE 880 112 880 48 WIRE 1200 112 1200 48 WIRE 1392 112 1392 48 WIRE -112 160 -112 48 WIRE 1600 192 1440 192 WIRE 240 224 208 224 WIRE 288 224 288 96 WIRE 288 224 240 224 WIRE 448 224 288 224 WIRE 688 224 688 48 WIRE 688 224 528 224 WIRE 880 240 880 176 WIRE 1024 240 1024 176 WIRE 1200 240 1200 192 WIRE 1392 240 1392 208 WIRE 1600 240 1600 192 WIRE 688 272 688 224 WIRE -112 304 -112 240 WIRE 1600 352 1600 320 WIRE 288 384 288 224 WIRE 688 432 688 352 WIRE 688 432 352 432 WIRE 688 480 688 432 WIRE 288 592 288 480 WIRE 688 624 688 560 WIRE 288 704 288 656 FLAG -112 304 0 FLAG 288 704 0 FLAG 688 624 0 FLAG 880 240 0 FLAG 1024 240 0 FLAG 1200 240 0 FLAG 768 -64 OUT FLAG 240 224 GATE FLAG 352 48 SRC FLAG 1392 240 0 FLAG 1600 352 0 SYMBOL voltage -112 144 R0 WINDOW 0 58 41 Left 2 WINDOW 3 59 78 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 48 SYMBOL npn 352 384 M0 WINDOW 0 118 26 Left 2 WINDOW 3 94 68 Left 2 SYMATTR InstName Q1 SYMATTR Value 2N4401 SYMBOL zener 304 656 R180 WINDOW 0 -81 49 Left 2 WINDOW 3 -107 6 Left 2 SYMATTR InstName D1 SYMATTR Value DZ5.6 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 432 64 R270 WINDOW 0 77 58 VTop 2 WINDOW 3 71 58 VBottom 2 SYMATTR InstName R1 SYMATTR Value 30 SYMBOL res 544 208 R90 WINDOW 0 71 56 VBottom 2 WINDOW 3 80 58 VTop 2 SYMATTR InstName R2 SYMATTR Value 10K SYMBOL res 704 368 R180 WINDOW 0 -56 70 Left 2 WINDOW 3 -62 34 Left 2 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL res 704 576 R180 WINDOW 0 -59 76 Left 2 WINDOW 3 -67 40 Left 2 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL res 1008 80 R0 WINDOW 0 61 42 Left 2 WINDOW 3 61 78 Left 2 SYMATTR InstName R5 SYMATTR Value 1K SYMBOL cap 864 112 R0 WINDOW 0 53 16 Left 2...

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Fred Abse 13 years ago

Sorry, my bad. AN8 it is.

"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)

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Jim Thompson 13 years ago

If a part has a model name NMOS, how do you tell WHOSE NMOS it is?

Just put a "spice directive" into the schematic...

.LIB \Path\Filename.lib

I do that all the time to avoid conflicting part/model names for different processes. ...Jim Thompson

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Jim Thompson 13 years ago

which

Wake up and learn to read... the regulator portion is the very same as yours, predating "yours" by 8 months.

The discussion here is not about charge pumps, it's about depletion-mode regulators.

Why don't you see if you can "guess" the final version? Actually I think I DID post it. ...Jim Thompson

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John Fields 13 years ago

worked

And believe you, who won't even address the errors, let alone try to correct them? Not likely.

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John Larkin 13 years ago

which

The topology is at least 70 years old. It was done with two vacuum tubes and one VR tube, same as the topology I posted, except that there usually wasn't an explicit current-limiting resistor.

It's about circuits that work, and ones that won't work.

Mine works, yours doesn't.

That's your favorite trick, claiming you can do stuff without revealing how. Whatever you did, it's probably clumsy.

Actually I

That's senility talking. I asked several times, and I don't recall you ever posting anything that will actually work.

Post it now.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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Jamie 13 years ago

worked

You know, if you don't look for it, you'd never know..

Jamie

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John Larkin 13 years ago

worked

They're just warnings. I could edit out the END directives, but why bother? The model works.

You're just whining, too.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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John Larkin 13 years ago

Then I'd put it back.

Quit whining and design something.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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John Larkin 13 years ago

Not a bad deal for what it does.

They are made in Russia, probably on an old non-epitaxial diffused transistor production line. Note the remarkable Ft.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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Jim Thompson 13 years ago

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won't

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Beg for it >:-} ...Jim Thompson

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Jim Thompson 13 years ago

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Here it is, NOLA white trash...

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Now stop with the bloviating bull-s*it. ...Jim Thompson

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John Larkin 13 years ago

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Hilarious, parts-rich hack, as usual. It looks like it blew up at first, so you had to add R17.

If it's in production, why the question marks?

Where can I buy those 1Nxxxx diodes?

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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John Larkin 13 years ago

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won't

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I didn't, because I knew you couldn't stand to not post it. You held out for all of 10 minutes.

What a wuss you are.

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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Jim Thompson 13 years ago

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all

Better than a NOLA f*ck-head with white-trash parents. ...Jim Thompson

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Jim Thompson 13 years ago

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Dumb as a stump, you are. This is an October 2012 drawing. It's been in production since then. The markings simply reflect banter between me and the power supply manufacturer in New Zealand.

Of course, you, Larkin, wouldn't actually know how round-the-world team designing works.

Larkin is a NOLA white-trash f*ck-head... and that's an accurate description.

Pecksniffian echo (you know who you are), avoid getting involved. I'm going hunting...

My magical part, just dial-in the desired part number >:-} I have libraries for everything. Larkin can't even get one part right. ...Jim Thompson

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bloggs.fredbloggs.fred 13 years ago

That's amateurish. See the write-up for Figure 10 and use a cheap $0.17 78L12 that gets you where you need to be.

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John Larkin 13 years ago

that gets you where you need to be.

That's OK, but it probably doesn't guarantee the 78L12 dropout voltage.

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John Larkin Highland Technology Inc

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jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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bloggs.fredbloggs.fred 13 years ago

Just OK??? It's a complete precision regulator. This may come as a surprise to you but the 3-terminal regulator forces the VGS of the depletion FET to support its current and not the other way around. If you need an absolute guarantee, there is a simple (almost trivial) way to make the voltage diffe rential across the 3-terminal stay above the minimum dropout threshold, whi ch will be left as an exercise for the student.

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John Fields 13 years ago

worked

Yeah, sure. Then they'd wipe it out and you'd put it back in again, and they'd wipe it out again and so on, ad infinitum? You're a childish hypocrite who'd bite off his nose to spite his face when he's given good counsel.

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Jamie 13 years ago

that gets you where you need to be.

The gate being connected directly to the output with HV on the other side of the fet, does not give ma a warm and fuzzy feeling with fast transients with all that miller, hope the caps don't fail.

I think that circuit needs a crowbar if that was ever seriously put in use. Maybe plant some 1.5k or better type TVSes on those nodes.

I don't know if sims would reveal enough collateral damage, the models in Ltspice seem to think they can operate beyond infinity.

Just my opinon, don't pay no mind to me, just a foot hill hick.

Jamie

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low power, HV-in regulator with depletion mosfet

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