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Old 20th March 2008, 03:58 AM   #31
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Something like this.
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Old 20th March 2008, 11:13 AM   #32
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How do you calculate the resister after the IXYS CCS - in relation to the IXYS in terms of current or in relation to what the VR needs to see? Could you give an example to illustrate? Thanks!
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Old 20th March 2008, 01:00 PM   #33
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Not sure if I understand. Are you talking about the resistor in my latest schematic, tucked up against the source of the FET? This is chosen based on the total current I want to provide (23mA). I select it as an approximation based on the datasheet:

http://ixdev.ixys.com/DataSheet/98704.pdf

This gets you close, but you would really want to test for the optimal value.

There's a few threads on this and the DN2540 you could check out. They really do work well.
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Old 20th March 2008, 02:45 PM   #34
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Hi Zigzagflux. Check your email.
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Old 20th March 2008, 09:13 PM   #35
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Are you out there?
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Old 20th March 2008, 09:52 PM   #36
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Sent you a reply email few hours ago...
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Old 20th March 2008, 10:11 PM   #37
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Hi Zig: I like the ixys current regulator plus vr tube voltage regulator approach for the PS. I am using it myself in a dht preamp that I'm working on. I also agree that given that setup, there is no longer a need for a choke in the PS. Keep up the good work!!
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Old 20th March 2008, 10:45 PM   #38
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Quote:
Originally posted by zigzagflux
Sent you a reply email few hours ago...
Oops. Forgot about THAT email address.


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