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...
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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.
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.
Oneminde
This thread has been quiet for a while, so lets look at some news. Read article and comment what you think.
UF3SC065007K4S - data sheet is attached.
This SiC FET device is based on a unique ‘cascode’ circuit configuration, in which a normally-on SiC JFET is co-packaged with a Si MOSFET to produce a normally-off SiC FET device.
UnitedSiC Titles New SiC FETs as the “Lowest RDS(on) SiC Power Devices on the Planet” - News
UF3SC065007K4S - data sheet is attached.
This SiC FET device is based on a unique ‘cascode’ circuit configuration, in which a normally-on SiC JFET is co-packaged with a Si MOSFET to produce a normally-off SiC FET device.
UnitedSiC Titles New SiC FETs as the “Lowest RDS(on) SiC Power Devices on the Planet” - News
I would just use the SiC jfet as is, in a design similar to a classic 2-stage SE partial feedback tube amp with output transformer. Here's an example -
"SiC Puppy SE Amp Using Semisouth 085 JFET
It's time I revisited this design with some improvements, most notably a follower stage to get around the nasty gate leakage of the SiC jfet.
"SiC Puppy SE Amp Using Semisouth 085 JFET
It's time I revisited this design with some improvements, most notably a follower stage to get around the nasty gate leakage of the SiC jfet.
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Hi.I have found some Sic mosfets UJ3C120040K3S from local distributor.Can they be used for audio? J2 amp maybe? Any advantages over IRFP240? Maybe i can use a pair of them instead of 2 pairs of IRFP240?
This SiC FET device is based on a unique ‘cascode’ circuit
configuration, in which a normally-on SiC JFET is co-packaged with a Si
MOSFET to produce a normally-off SiC FET device. The device’s
standard gate-drive characteristics allows for a true “drop-in
replacement” to Si IGBTs, Si FETs, SiC MOSFETs or Si superjunction
devices. Available in the TO-247-3L package, this device exhibits ultralow gate charge and exceptional reverse recovery characteristics,
making it ideal for switching inductive loads, and any application
requiring standard gate drive.
This SiC FET device is based on a unique ‘cascode’ circuit
configuration, in which a normally-on SiC JFET is co-packaged with a Si
MOSFET to produce a normally-off SiC FET device. The device’s
standard gate-drive characteristics allows for a true “drop-in
replacement” to Si IGBTs, Si FETs, SiC MOSFETs or Si superjunction
devices. Available in the TO-247-3L package, this device exhibits ultralow gate charge and exceptional reverse recovery characteristics,
making it ideal for switching inductive loads, and any application
requiring standard gate drive.
Attachments
it seems as Treshold Ugs (p.5) is in range of 5V, so smidfe higher than usual mosfets
also SOA graph (Fig. 17) is showing that part is good for DC, our normal range of currents and voltages
https://unitedsic.com/datasheets/DS_UJ3C120040K3S.pdf
also SOA graph (Fig. 17) is showing that part is good for DC, our normal range of currents and voltages
https://unitedsic.com/datasheets/DS_UJ3C120040K3S.pdf
Hi.Mark on ACA forum wrote:
""Because their transconductance dIout/dVin is not constant unless Iout > 10 amperes, which is well outside the range of standard bias currents in audio gear, and well outside the range of standard heat dissipation capability of audio enclosures. It's laughably beyond the max possible current of the ACA power supply and howlingly beyond the max possible dissipation of the ACA heatsinks and chassis.
Here's the transconductance plot from the manufacturer's datasheet ""
""Because their transconductance dIout/dVin is not constant unless Iout > 10 amperes, which is well outside the range of standard bias currents in audio gear, and well outside the range of standard heat dissipation capability of audio enclosures. It's laughably beyond the max possible current of the ACA power supply and howlingly beyond the max possible dissipation of the ACA heatsinks and chassis.
Here's the transconductance plot from the manufacturer's datasheet ""
Attachments
