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Old 26th October 2012, 09:10 PM   #31
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Take the MRFE6VP5600HR5, you get it from Mouser and DigiKey in single quantities.

1667W total device power dissipation for 158USD and Crss 1.6pF, Ciss 342pF !!!!!

No SiC-switching-transistor will ever reach this performance !

Silicon LDMOS for RF is a bargain, if you compare it to SiC.
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Old 26th October 2012, 09:21 PM   #32
qusp is offline qusp  Australia
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yes, but we are not talking about RF are we? have you actually used it for audio, or just going by the numbers presented? what typical match between the 2 devices? I wouldnt want to buy 100 x 290usd devices to match... I think you will find the power of this device is drastically reduced for linear audio applications, particularly Class A, when its designed for Class C
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Old 26th October 2012, 10:27 PM   #33
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Quote:
Originally Posted by Jon Lord View Post
Take the MRFE6VP5600HR5, you get it from Mouser and DigiKey in single quantities.

1667W total device power dissipation for 158USD and Crss 1.6pF, Ciss 342pF !!!!!
1667W on 25 degrees C. 1.6/345 above 30V, breakdown voltage is 120V. Can't find transfer curves usable for audio applications.
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Old 15th November 2012, 01:31 AM   #34
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Originally Posted by Wavebourn View Post
1667W on 25 degrees C. 1.6/345 above 30V, breakdown voltage is 120V. Can't find transfer curves usable for audio applications.
I would check IXYS RF for laterals
EDIT
BTW Infineon makes the same staff as semisouth... samples for now.
I've been told on PCIM that HV Jfets will die out as soon as decent MOSFET gate could be developed
One can't make carbon oxide gate insulator ;-) seems that nothing dielectric adheres good enough to SiC

Last edited by alexberg; 15th November 2012 at 01:38 AM.
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Old 15th November 2012, 06:29 AM   #35
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Silicon nitride might make an ok gate insulator (silicon oxide is the customary solution), but nitride is a right bas***d to work with. Good for passivation, though.
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Old 15th November 2012, 07:26 AM   #36
jcx is offline jcx  United States
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Default 120 dB feedback factor @20 kHz?

IXYS DE150-501N04A is my fantasy US$50 audio output MOSFET - 500 V, 4.5A, 200W RF packaging

DE150-201N09A 200 V, 9 A looks OK to me too

Last edited by jcx; 15th November 2012 at 07:38 AM.
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Old 15th November 2012, 07:52 AM   #37
qusp is offline qusp  Australia
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cant find the infineon coolsic jfet anywhere at any of their distribution partners, I fear its only sold as part of a full solution
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Old 15th November 2012, 10:13 AM   #38
tbece is offline tbece  Australia
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Quote:
Originally Posted by Jon Lord View Post
Take the MRFE6VP5600HR5, you get it from Mouser and DigiKey in single quantities.

1667W total device power dissipation for 158USD and Crss 1.6pF, Ciss 342pF !!!!!

No SiC-switching-transistor will ever reach this performance !

Silicon LDMOS for RF is a bargain, if you compare it to SiC.
I am playing with much smaller versions of the above, if you like, check out Renesas RD16HHF1 (TO220, Glyn, $3-5/ea). I was hoping to discover Nirvana. Instead, as good as they sound an measure, they are not exactly layout tolerant - when they take off (and they DO take off, especially when paralleled) the action is at >200MHz. For starters, we are talking ~1K Gate de-Q resistors, and I am now thinking of a proper RF layout for an audio amp.

I would be curious to see some results on the MRFE's
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Old 15th November 2012, 10:33 AM   #39
MiiB is offline MiiB  Denmark
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I see they advice Roger PCB material... They should be tamable but I guess you need ceramics between the legs, to do so. For a single-ended Preamplifier output they may be marvelous.
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Old 15th November 2012, 01:33 PM   #40
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Originally Posted by tbece View Post
I am playing with much smaller versions of the above, if you like, check out Renesas RD16HHF1 (TO220, Glyn, $3-5/ea). I was hoping to discover Nirvana. Instead, as good as they sound an measure, they are not exactly layout tolerant - when they take off (and they DO take off, especially when paralleled) the action is at >200MHz. For starters, we are talking ~1K Gate de-Q resistors, and I am now thinking of a proper RF layout for an audio amp.

I would be curious to see some results on the MRFE's
Could you point us to a link to this ? Google throws up lots of strange mitsibusy devices not sure if it's the same... Also what's Glyn and where can we try n buy these lil critters ? Cheers
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