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Old 15th February 2014, 11:13 PM   #11
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Originally Posted by TheGimp View Post
This is a SMT device that requires proper pad layout for thermal dissipation, otherwise you will not get near that dissipation level witout exceeding the device TJmax.

Thanks, we shall take this into account.
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Old 15th February 2014, 11:14 PM   #12
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Originally Posted by ctaudio View Post
I'd be interested and I'd suggest some gate protection diodes.
ctaudio, for that I am not very familiar. Could you suggest what parameters we shall choose?
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Old 15th February 2014, 11:19 PM   #13
AJT is offline AJT  Philippines
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count me in....
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Old 15th February 2014, 11:39 PM   #14
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Originally Posted by Magz View Post
I prefer to build my own p2p, but this could be Very useful for retro-fitting existing circuits where space is at a premium.
Yes, that's true. I was thinking if there is market for exotic resistor, fancy coupling cap in re-servicing vintage gears, why not a modularized ccs? a working version with low part counts and costing only few bucks should be attractive.
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Old 16th February 2014, 12:30 AM   #15
ctaudio is offline ctaudio  United States
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You can add a 15v zener between gate and source to protect against exceeding VGS.
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Old 16th February 2014, 02:43 AM   #16
DUG is offline DUG  Canada
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Anybody look at the capacitance this will have?
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Old 16th February 2014, 03:40 AM   #17
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Originally Posted by DUG View Post
Anybody look at the capacitance this will have?
C(iss)=98pF, C(oss)=8.5pF C(rss)=3.4pF, typical value when V(GS)=-3V,V(DS)=25V,f=1MHz

These capacitance values are somewhere between the popular 01N100D and DN2540.

For your information:
IXTP 01N100D http://ixapps.ixys.com/DataSheet/98812.pdf
Infineon bsp135 http://www.infineon.com/dgdl/BSP135_...3c1fd4c839399b
Supertex DN2540 http://www.supertex.com/pdf/datasheets/DN2540.pdf

Actually, if PCB foot print is not a problem for you and you are looking for more robust ccs kit set. K&K audio is making a series of kit for DIYers with reasonable price:

K & K Audio - Lundahl Transformers, audio DIY kits and more
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Old 16th February 2014, 08:05 AM   #18
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Originally Posted by ctaudio View Post
You can add a 15v zener between gate and source to protect against exceeding VGS.
Not sure about the zener's polarity, ctaudio can you take a look on this?


P.S. the original circuit wasn't right, you can't get anti-triode output with that configuration. So revised now, it is still four pins out, A) HV-in, B)P1/out1 C) P2/out2 D) mu-follower out
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Old 16th February 2014, 10:04 AM   #19
euro21 is online now euro21  Hungary
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If you don't mind there are some advices.

R4, R5 gate stoppers near (as possible) to gate(s).
Connect R5 "external" pin to "p2" output.
Connect trimmer wafer to "D.)" point (lower FET source).
Connect protection zeners anode to gate stoppers "external" pin.
Maybe the current limiting resistor (for example 10R serial to trimmer) will protecting the CCS, if trimmer value approaching zero.
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Old 16th February 2014, 11:51 AM   #20
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Originally Posted by euro21 View Post
If you don't mind there are some advices.

R4, R5 gate stoppers near (as possible) to gate(s).
Connect R5 "external" pin to "p2" output.
Connect trimmer wafer to "D.)" point (lower FET source).
Connect protection zeners anode to gate stoppers "external" pin.
Maybe the current limiting resistor (for example 10R serial to trimmer) will protecting the CCS, if trimmer value approaching zero.

Thanks Euro21, of course I treasure your advices. Hope I am getting you right. It is now three connection points device.

If I am not getting you right, the attached zip file contains a file called proposed circuit. Please share your idea with us. Million thanks!
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Last edited by sulcorebutia; 16th February 2014 at 12:19 PM.
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