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Old 10th September 2011, 02:59 PM   #1
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Default LatFET OPS.

Lateral FET Output stage.

With 3 pairs of Exicon ECW20N20-Z/ECW20P20-Z 16A, 250W, TO-264 Lateral FETs.

Modular build, with separate IPS-VAS board.

Not quite done wtih the layout, but almost.
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Old 10th September 2011, 03:29 PM   #2
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R20 to output is not complete
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Old 10th September 2011, 03:36 PM   #3
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Originally Posted by Havenwood View Post
R20 to output is not complete
I know.

There will be mounted an output coil parallel with R20, just not done yet.
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Old 10th September 2011, 04:36 PM   #4
AndrewT is offline AndrewT  Scotland
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No source resistors !!!!
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Old 10th September 2011, 04:53 PM   #5
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No source resistors !!!!
Matching of the Lateral FETs means no source resistors should be needed.
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Old 10th September 2011, 05:13 PM   #6
AndrewT is offline AndrewT  Scotland
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Are you sure?
Will anyone else agree with you?
Will all builders copying your build instructions follow your recommended matching procedure? Will they be aware of what needs to be matched and capable of meeting the standards expected?
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Old 10th September 2011, 05:23 PM   #7
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Are you sure?
Will anyone else agree with you?
Will all builders copying your build instructions follow your recommended matching procedure? Will they be aware of what needs to be matched and capable of meeting the standards expected?
Well, reading Cordell's excellent book, using source resistors for current sharing among parallel FETs is more or less useless.

Better to match Vgs instead.
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Old 10th September 2011, 05:23 PM   #8
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From profusions webpage regarding ECW20N20-Z:

Easy paralleling (devices available in selected categories to enhance paralleling performance)
These devices do not have an integral gate - source protection diode and care must be taken with static handling precautions and the appropriate protection in the amplifier circuit
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Old 10th September 2011, 05:25 PM   #9
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Originally Posted by tommy1000 View Post
From profusions webpage regarding ECW20N20-Z:

Easy paralleling (devices available in selected categories to enhance paralleling performance)
These devices do not have an integral gate - source protection diode and care must be taken with static handling precautions and the appropriate protection in the amplifier circuit
Ah yes, that as well. Paralleling should be fairly straightforward.
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Old 10th September 2011, 08:45 PM   #10
wahab is offline wahab  Algeria
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No source resistors doesnt matter provided the Vth are the same
and that the temperature coeeficient is negative already at low current,
preferably 100mA , as with renesas l fets.
I use three paralleled hitachi lateral fet pairs , and the amp did and
still work for twenty years...

The protection diodes should be connected to the bases of the drivers,
not to the emitters.
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