Does someone knows what mosfet is this?

[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!

 

[SunRa]

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...

 

[jneutron]

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

 

[poynton]

Re: Re: Does someone knows what mosfet is this?

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

 

[SunRa]

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...

 

[SunRa]

Here is a link to a GamuT amplifier using the same device.

 

[SunRa]

This one from Microsemi maybe?

 

[SunRa]

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?

 

[SunRa]

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...

 

[KSTR]

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
EDIT: Spelling (as usual)

 

[SunRa]

Thank you Klaus for the reply.

I took a look at the device you recommend and I agree with your comments. However there is one drawback which seems to appear in all devices of this type: The huge input capacitance. The minimum seems to be around 4000 pF. The device above is in the 6000 pF region. By comparison, the BUZ900 series may go as low as 500pF..

Cheers!

 

[60]

http://www.pwrx.com/

 

[sdman]

Does someone know?

Anyone know yet what mosfet Thorens used in the TEM3200?

sam