New CCS/ depletion mode MOSFETs available... experience anyone? - diyAudio
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Old 26th April 2014, 12:04 PM   #1
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Lightbulb New CCS/ depletion mode MOSFETs available... experience anyone?

Recently, there are a lot more high voltage depletion mode mosfets available then previous.
Like the IXTH6N100D2.
http://ixdev.ixys.com/DataSheet/DS10...TH6N100D2).pdf
Seems too good to be true. I remember the people trying to get their hands on a 10M45S or a dn2540.
The IXTH6N100D2 is easy to find and dwarfs the old parts specs; 1000v 6A!
Am I missing something?

Has anyone used this (or similar) part as a CCS in tube amps?
Or as a pass device in cascade CCS?

Paul

Last edited by pauldune; 26th April 2014 at 12:11 PM.
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Old 26th April 2014, 01:16 PM   #2
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Capacitance is higher with the higher voltage/current part. No free lunch. So there is benefit to using the lower voltage part when you don't require higher voltages. Same for current.
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Old 26th April 2014, 02:19 PM   #3
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Should be okay, K&K has been using this mosfet for their HV shunt regu kits for awhile now.
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Old 26th April 2014, 02:35 PM   #4
jcx is offline jcx  United States
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just check for distributor stock

for V regulator use the parasitic C isn't too big a limitation

but for CCS load swinging with full V audio you do want the lowest Id rated part that fits the application to keep the parasitic C down

using a 6A rated part for 30-60 mA just isn't a good match when 100-800 mA rated parts are available too

Last edited by jcx; 26th April 2014 at 02:46 PM.
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Old 26th April 2014, 02:52 PM   #5
Ryssen is offline Ryssen  Sweden
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Quote:
when 100-800 mA rated parts are available too
What name do they have?
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Old 26th April 2014, 03:27 PM   #6
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DN2540 is 450V, and low capacitance. There is a TO220 part good for a range of at least 2- 50mA in my experience .The BSP135 is a SMT part also with low capacitance, and goes to 600V but is only rated at 20mA and much less dissipation than the DN2540. The BSP135 is however good down to 100s of microamps, and works well in a cascode.

DN2540 + BSP135 cascode works very well indeed . So does the big Ixys 1kv part under discussion and the DN2540. I have tested this combination; with 50V across the cascode the impedance is still more than 10M ohm at 50khz, so more than good enough for our purposes!
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Old 26th April 2014, 03:38 PM   #7
jcx is offline jcx  United States
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IXYS Website > Product Portfolio > Power Devices >discrete mosfet>depletion mode, clik on Id(on) column lable to sort by Idss...
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Old 26th April 2014, 04:07 PM   #8
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Unfortunately all of these are only available through Mouser in Europe. Which is a bummer.

Shoog
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Old 26th April 2014, 04:16 PM   #9
JLH is offline JLH  United States
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I use the IXTP01N100D most of the time.
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Old 26th April 2014, 04:21 PM   #10
disco is offline disco  Netherlands
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Quote:
Originally Posted by Shoog View Post
Unfortunately all of these are only available through Mouser in Europe. Which is a bummer.

Shoog
Why? They have a bank account in Germany if you don't use credit card.
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