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new SiC JFETs ?
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Old 9th July 2019, 08:31 PM   #381
Nelson Pass is offline Nelson Pass  United States
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new SiC JFETs ?
(I was speaking generically....)

Yes, this is a good looking DC SOA. Also, the temperature coefficient
at the currents we are thinking about don't look very problematic.
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Old 9th July 2019, 08:40 PM   #382
Oneminde is offline Oneminde  Sweden
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Quote:
Originally Posted by Nelson Pass View Post
(I was speaking generically....)

Yes, this is a good looking DC SOA. Also, the temperature coefficient
at the currents we are thinking about don't look very problematic.
Its nice of you to drop in, especially for a n00b who just want to learn and earn and golden star

Do you consider the UJ3N065025K3S plausible for the F5-F6 series, optimization and biasing aside, or perhaps a completely different architecture to start with ?

- EDIT -
Almost forgot about the SIT range...




Last edited by Oneminde; 9th July 2019 at 08:54 PM.
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Old 9th July 2019, 09:45 PM   #383
Nelson Pass is offline Nelson Pass  United States
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new SiC JFETs ?
F5 requires complementary P and N parts, so it's out. F6 would be a candidate,
as would the SE amplifiers.

Plausible? Yes, but I haven't tried it that I recall.
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Old 9th July 2019, 10:03 PM   #384
Oneminde is offline Oneminde  Sweden
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Quote:
Originally Posted by Nelson Pass View Post
F5 requires complementary P and N parts, so it's out. F6 would be a candidate,
as would the SE amplifiers.

Plausible? Yes, but I haven't tried it that I recall.
JFETs conduct in both directions, so drain and source can be "inverted", unless there is a special case. "same sex" as Zen Mod call it. Backed up by Erno Borbely. Ofc I can't speak for all architectures. Just looked at the F5 - Enhancement mode MOSFET .. so that would certainly need to have the voltage polarity inverted (Q3/Q4).

If I'm way off... just correct me.


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Old 9th July 2019, 10:05 PM   #385
Zen Mod is offline Zen Mod  Serbia
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new SiC JFETs ?
naah

I prefer walking with head up ...... so no playing inverting games ...
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Old 9th July 2019, 10:10 PM   #386
Oneminde is offline Oneminde  Sweden
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Its should more or less just be flipping the V polarity since the UnitedSiC is N-chn deplition, so the P-chn Enhanced in the Q4 position is the only one who need a polarity flip so that both Q3 and Q4 is -V




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Old 10th July 2019, 05:29 PM   #387
Nelson Pass is offline Nelson Pass  United States
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new SiC JFETs ?
You would want to examine this issue on a case by case basis.

Some Jfets are truly symmetrical. Many, not so much.
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Old 10th July 2019, 05:32 PM   #388
Oneminde is offline Oneminde  Sweden
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Originally Posted by Nelson Pass View Post
You would want to examine this issue on a case by case basis.

Some Jfets are truly symmetrical. Many, not so much.
Oh absolutely. Testing the UnitedSiC JFET would first need to happen on the test bench so one can check as many things as possible, perform endurance test and so forth. Something I might do eventually unless someone gets it done before me.

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