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Old 16th February 2008, 02:52 PM   #1
SunRa is offline SunRa  Romania
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Default Does someone knows what mosfet is this?

I have spoted what looks like a high power mosfet in this 6moons preview of Thorens .

There is a picture of the device almost on the bottom of the page, where it shows the number of components in the signal path. The tubes are named but not the output mosfet. Could it be a custom made one? Highly improbable though...

Thank you!
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Old 17th February 2008, 02:23 PM   #2
SunRa is offline SunRa  Romania
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No one, not a hint?

They look like high current, high voltage probably huge capacitance also, but should do great in current buffer stages, with a hefty driver stage...
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Old 20th February 2008, 03:49 PM   #3
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Default Re: Does someone knows what mosfet is this?

Quote:
Originally posted by SunRa
I have spoted what looks like a high power mosfet in this 6moons preview of Thorens .

There is a picture of the device almost on the bottom of the page, where it shows the number of components in the signal path. The tubes are named but not the output mosfet. Could it be a custom made one? Highly improbable though...

Thank you!
It looks like a SOT-227B package, like this:

http://www.ixyspower.com/store/Family.aspx?i=5

But I'm not sure that package is 300 ampere capable.
Ixys has 700 watt dissipation.

Maybe the isoplus 227 package:

http://www.ixyspower.com/store/Family.aspx?i=2

Cheers, John
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Old 20th February 2008, 04:32 PM   #4
poynton is offline poynton  United Kingdom
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Default Re: Re: Does someone knows what mosfet is this?

Quote:
Originally posted by jneutron


It looks like a SOT-227B package, like this:

http://www.ixyspower.com/store/Family.aspx?i=5

But I'm not sure that package is 300 ampere capable.
Ixys has 700 watt dissipation.

Maybe the isoplus 227 package:

http://www.ixyspower.com/store/Family.aspx?i=2

Cheers, John

Looking at the image in the review, I would say the isoplus 227.
But the specs are nowhere close !!!!!

Maybe the picture is a 'red herring' to throw people off the scent !!

Try this :- http://jp.digikey.com/scripts/dksearch/dksus.dll

Andy


Thorens image
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File Type: gif schematic.gif (7.2 KB, 401 views)
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Old 16th March 2008, 07:06 PM   #5
SunRa is offline SunRa  Romania
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Thank you all for response and sorry for my late reply.

The review is updated, it seems that the devices are having a transconductance of 40A/V and it seems they are used in the GamuT amps as well...
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Old 16th March 2008, 07:13 PM   #6
SunRa is offline SunRa  Romania
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Here is a link to a GamuT amplifier using the same device.
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Old 16th March 2008, 07:32 PM   #7
SunRa is offline SunRa  Romania
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This one from Microsemi maybe?
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Old 16th March 2008, 08:22 PM   #8
SunRa is offline SunRa  Romania
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Forget my previous post, the current is way to small.

After searching on digikey it came obvious that the only parts that roughly match are the ones from IXYS as are the only ones with a current of 280-340Amps. Any thought on this?
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Old 18th March 2008, 08:57 PM   #9
SunRa is offline SunRa  Romania
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It would be great if someone would know what part is used in those amplifiers.

The ones I've identified with similar ratings have something in common.. the very high input capacitance. This could put troubles in any design...
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Old 20th March 2008, 07:28 PM   #10
KSTR is offline KSTR  Germany
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While it surely isn't the module used by Thorens, this Micro-Semi module looks promising for DIY-approaches: APL501J, which has properties better suited to linear operation than the APT models which are optimized for hard switching duties. According to Micro-Semi information it can in fact withstand its rated 500W Pd (if cooled appropriately) at lower Vds (<100V) which would happen to be the case in a circlotron. Module price is some 130US$.

From the conservative rating for the module used in the Thorens I suspect it is a normal switch-mode device which is prone to hot-spotting failures and must be heavily derated for linear mode operation.


BTW, I like that design and the ideas behind the TEM3200 pretty much.

- Klaus
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