Weeell, but the SJEP data sheet gives the capacitances at Vds = 100V / Vgs = 0V, while 2SK1058 is quoted at Vds = 10V / Vgs = -5V. If you correlate the data based on the charts (at least for Ciss, there's no Coss / Crss chart in the 2SK1058 data sheet), you get:
SJEP120R100
Ciss = ~850pF
2SK1058
Ciss = ~330pF x 6 = 1,980 pF
Still a lot, but not 5.5x as much, "only" 2.5x. So perhaps 4 in parallel selected for the highest yfs would just about cut the mustard... (2SK286, with 1.4 typ / 2.5 max yfs and Ciss of ~400pF, could still be a cheaper / easier to find option.)
SJEP120R100
Ciss = ~850pF
2SK1058
Ciss = ~330pF x 6 = 1,980 pF
Still a lot, but not 5.5x as much, "only" 2.5x. So perhaps 4 in parallel selected for the highest yfs would just about cut the mustard... (2SK286, with 1.4 typ / 2.5 max yfs and Ciss of ~400pF, could still be a cheaper / easier to find option.)
Attachments
Can this silicon carbide power mosfet be a candidate?
https://www.mouser.it/datasheet/2/90/c2m0280120d-1795432.pdf
https://www.mouser.it/datasheet/2/90/c2m0280120d-1795432.pdf
P.S. Found the capacitance charts for the 2SK1058 in TO-3, née 2SK135, so at comparable Vds / Vgs (10V / 0V), we'd get:
SJEP120R100
Ciss = ~850pF
Coss = ~300pF
Crss = ~300pF
2SK1058
Ciss = ~330pF
Coss = ~310pF
Crss = ~10pF
SJEP120R100
Ciss = ~850pF
Coss = ~300pF
Crss = ~300pF
2SK1058
Ciss = ~330pF
Coss = ~310pF
Crss = ~10pF
Attachments
F8 is innovative, an example of unmatched simplicity and efficiency-performance.
Let's broaden the view of this innovation by considering a classical power amp which has the familiar 3 stages. An input diff amp, followed by the last voltage amp and followed by complementary buffers. Let's do unto this classical amp what Mr. Pass did to J2.
Disable one semi from the the input diff amp, and return loop feedback to the source or emitter of the remaining semi in diff amp. Maybe easier written than done; but its an experiment!
Best
Anton
Let's broaden the view of this innovation by considering a classical power amp which has the familiar 3 stages. An input diff amp, followed by the last voltage amp and followed by complementary buffers. Let's do unto this classical amp what Mr. Pass did to J2.
Disable one semi from the the input diff amp, and return loop feedback to the source or emitter of the remaining semi in diff amp. Maybe easier written than done; but its an experiment!
Best
Anton
Don't feel bad. Initial front end to Last Sony Vfet Amp is M2 front end w/ Edcor.
Just for you....
Attachments
Don't feel bad. Initial front end to Last Sony Vfet Amp is M2 front end w/ Edcor.
Just for you....
Nice one.
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