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Single High power Mosfet for big Single Ended Amp ?
Single High power Mosfet for big Single Ended Amp ?
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Old 2nd February 2016, 11:46 AM   #1
Ado is offline Ado  Indonesia
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Default Single High power Mosfet for big Single Ended Amp ?

Since I'm crazy for Mosfet SE sound signature rather than PP Class A I've built , Anyone pls tell me what type of Mosfet device that could deliver 40-60Watt Power out in 8 Ohm load with only single device per ch ....

Just finished Pavel Macura SE Amp 17Watt, love the sound but need more power for my Heavy Speaker.
Years ago I also already built some SS's Class A PP like Bebe T,JLH,Hiraga,Firstwatt F4,F5,Tumos etc
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Old 2nd February 2016, 05:37 PM   #2
kacernator is offline kacernator  Czech Republic
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Default Nelson Pss Schade Feedback MOSFET 60W

Hi,

check out thie talk from BAF 2015 festival, where Nelson Pass presents SE mosfet ampifier 60W into 8 Ohms.

BAF 2015 Coverage
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Old 4th February 2016, 01:53 AM   #3
Ado is offline Ado  Indonesia
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Hi Kacernator,

Thanks for the link, since the Device (2SK77b) hard to find,but its give me idea to look for the max SOA of all my Stock devices for bigest SE Pout capabilities ....

Rgds
Ado
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Old 4th February 2016, 08:38 AM   #4
mt490 is offline mt490
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Maybe one of the big motor drive modules made by Semikron and the like?

Something like this: http://au.mouser.com/ProductDetail/V...ZtQYWK2A%3d%3d

Last edited by mt490; 4th February 2016 at 08:46 AM.
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Old 4th February 2016, 09:05 AM   #5
kacernator is offline kacernator  Czech Republic
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Quote:
Originally Posted by Ado View Post
Hi Kacernator,

Thanks for the link, since the Device (2SK77b) hard to find,but its give me idea to look for the max SOA of all my Stock devices for bigest SE Pout capabilities ....

Rgds
Ado
In that thread and in the Nelson Pass talk, he presents alternative with IXFN140N20P mosfet in schade feedback configuration. Check it out.

Here is the link to slides:
BAF Slides Nelson Pass | Audiohobby.com
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File Type: png baf2015-schade-mosfet.png (144.4 KB, 613 views)
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Old 4th February 2016, 11:46 AM   #6
AndrewT is offline AndrewT  Scotland
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Andrea has been designing single ended follower for what seems like decades.
the Power Folllower

One variation even has constant current ClassA while delivering power to the load.
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Old 4th February 2016, 11:53 AM   #7
sajti is offline sajti  Hungary
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And what about to use some common MOSFET as source follower, and provide bootstrapped drain voltage to it, to reduce the dissipation?

Sajti
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Old 9th February 2016, 07:56 AM   #8
Ado is offline Ado  Indonesia
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I need at least SE 50W/ch to free the load Spk choices due to their sesitivities, the Mosfet device candidates available out there. The problem how to reduce heatshink size , maybe the CCS usage : the Lamp,Big Resistor(do they still need the heatshink ?) or a heater element instead of a Giant Inductor...

Any suggestion wellcome.

Ado
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Old 9th February 2016, 08:27 AM   #9
sajti is offline sajti  Hungary
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Quote:
Originally Posted by Ado View Post
how to reduce heatshink size
Any suggestion wellcome.

Ado
Use fan. This will reduce the size, with about 50-70%, depending by the size, and speed of the fan.

Sajti
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Old 9th February 2016, 08:33 AM   #10
AndrewT is offline AndrewT  Scotland
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50W into 8ohms requires an output of 28.28Vpk and 3.536Apk into a non reactive test load.
You cannot get 50W into 8ohms by any other combinations of volts and amps.

A single ended amplifier that has a fixed maximum output determined by the bias setting of the output device must be set up to achieve that 3.536A into the test load.

That determines the heat and the sink requirement.

Attach a reactive 8ohms speaker that will demand more current than a dummy load will force the SE amplifier into current clipping on fast changing transients.
That will sound terrible.
To avoid current clipping one should set up the amplifier to pass transient currents far in excess of what a resistive dummy load will demand.
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