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Old 26th March 2012, 02:42 PM   #1
kees52 is offline kees52  Netherlands
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Default oscillating 2sk1058

hi all

I have a question, can a mosfet 2sk1058-j162 blow themsself if oscillating?

she did and the gate resistors did smoke, first I thought because of the plus 120 volts from driver did this but that is not the case, also with driver off it did kill the resistors, and now the 2sk1058 is short circuit.

A little learning here, I do like, the mosfets came from china, maybe she were bad also, pins were oxidated on egde of housing.

thanks
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Old 26th March 2012, 02:46 PM   #2
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any picture of the mosfet's ?
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Old 26th March 2012, 05:26 PM   #3
kees52 is offline kees52  Netherlands
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Originally Posted by ashok View Post
any picture of the mosfet's ?
the mosfet housing is oke, it is not blown appart.

just short circuit after big oscillation.

I try now verticals.
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Old 26th March 2012, 05:57 PM   #4
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The reason I'm asking for the picture is that we might be able to say if it's a fake. It will also help others to identify a fake part. There is another long thread about fake parts on this forum ! So if you can put up a picture it will be useful to others.

The oscillations could be just because it isn't up to spec and prone to oscillations. MAYBE ! Just make sure your part IS a fake ! If it's genuine then others will need to see how you are using the MOSFET. A circuit diagram will be helpful to give an opinion.
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Old 26th March 2012, 06:33 PM   #5
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by kees52 View Post
the mosfet housing is ok, it is not blown apart.

just short circuit after big oscillation.

I try now verticals.
Did you take any measurements to show that it was a Lateral and not a Vertical?
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Old 26th March 2012, 07:48 PM   #6
kees52 is offline kees52  Netherlands
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Originally Posted by AndrewT View Post
Did you take any measurements to show that it was a Lateral and not a Vertical?

tho blown ones are 2sk1058 and 2sj162, now I have put in (as test i will use laterals if I have them again). 2sk1530 and 2sj200, she do work, no problem but I have put extra gate protection diodes.

I did see that as there is oscillation there can be high gate voltage.

but here is schematic. if the drivertube is cold, there is high voltage on the mustage fet drain normally no problem but a supple who give voltage as the tubes is warm is better, also for the tube.

as you see in schematic gates are dc coupled to the 6C19p and his mu mosfet.

thanks.
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Old 26th March 2012, 08:11 PM   #7
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2sj200 and 2j162 have different pinout.
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Old 26th March 2012, 09:05 PM   #8
AndrewT is offline AndrewT  Scotland
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j200 are Vertical.
j162 are Lateral.

Lateral have the middle PIN as Source.
Vertical have the middle PIN as Drain.
Datasheet will confirm all of these.
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Old 26th March 2012, 09:20 PM   #9
kees52 is offline kees52  Netherlands
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Yes guys I now that, the printed circuit is made so both can installed. but I use normally only laterals, but she died and I have not others yet. I can do both, only the 2sk1530 has no gate diodes and so I put them in, with a servo the voltage will not be high if the driver tube is not warm yet.

Amp works by the way, now make quick a servo because a tube is not so stable one.
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Old 28th March 2012, 03:28 PM   #10
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by ashok View Post
The reason I'm asking for the picture is that we might be able to say if it's a fake. It will also help others to identify a fake part. There is another long thread about fake parts on this forum ! So if you can put up a picture it will be useful to others.

The oscillations could be just because it isn't up to spec and prone to oscillations. MAYBE ! Just make sure your part IS a fake ! If it's genuine then others will need to see how you are using the MOSFET. A circuit diagram will be helpful to give an opinion.
I do make pictures if I find them, the 2sk1530 is also blown yesterday, also this one did unstable motorboating and bam, simulating the amp is oke, no problems.

schematic here, the voltage preamp is not present, problem was with mu mosfet 6c19 and only with speaker connected, strange behavior not in simulations but maybe I am not so clever as I look, the most difficult things are the simpel ones.

Left is the vertical 2sk1035 mosfet, where the print is already gone, and left the lateral mosfet, other two of them are in a amp playing with no problems, the pins however breaks instantly if bend, that is what I did discover a while back.
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Last edited by kees52; 28th March 2012 at 03:52 PM.
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