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Old 10th February 2019, 04:11 AM   #1641
aspringv is offline aspringv  Australia
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You can split the rails with an active ground and get the firstwatt standard 23v rails.

Ground is just a state of mind.
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Old 10th February 2019, 07:43 AM   #1642
generg is offline generg  Germany
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The pucks have lower capacities with higher voltage.
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Old 10th February 2019, 03:02 PM   #1643
lae2 is offline lae2  United States
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Quote:
Originally Posted by generg View Post
The pucks have lower capacities with higher voltage.
Thank you. Ciss? I have looked at the curves for many of the SOT227 (pucks). The Ciss appears fairly asymptotic beyond 25 V?
What decision making applies to SOT227 versus PLUS247 for the same device?
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Old 10th February 2019, 03:38 PM   #1644
lae2 is offline lae2  United States
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Originally Posted by needtubes View Post
How about the IXFN40N90P as a match for the IXTN40P50P? Problem is, it seems to be hard to find here in the US. No one has it in stock.
When looking at device datasheets, what are the most important characteristics for choosing a P and N pair? Low/similar Ciss? Similar Transconductance?
The strategy for deciding upon a pair is to optimize "perfect “square law” cancellation of distortion?"
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Old 10th February 2019, 07:23 PM   #1645
generg is offline generg  Germany
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I was told that with source followers the Crss is the more important value to look at.

And this one declines with certain types at 25V considerably. Look at Pa´s Burning Amp speech 2016 and there was besides other this interesting picture....
So you must look for Ixys that go down in this way for Crss.

It is a pleasure to hear his explanations.
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File Type: jpg Nelsons IXYS capacitance.jpg (94.9 KB, 146 views)
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Old 10th February 2019, 11:13 PM   #1646
lae2 is offline lae2  United States
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Wow! What a great resource. Thank you so much. I almost missed that your screenshot was at 13 min. I thought the discussion about capacitance was over at 4m into part two. This talk answers a bunch of questions for me. I usually do not study videos. I don't have the patience. I must rethink. Thank you for alerting me to this talk. I imagine that if I was going to play with "pucks" using a typical FW PS; this P channel having asymptotic capacitance changes at a low voltage would be a candidate if I could match it up with an N channel.
http://ixapps.ixys.com/DataSheet/93001.pdf

Last edited by lae2; 10th February 2019 at 11:33 PM.
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Old 10th February 2019, 11:57 PM   #1647
lae2 is offline lae2  United States
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A candidate if I could match it with a P channel.
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Old 11th February 2019, 12:02 AM   #1648
Zen Mod is offline Zen Mod  Serbia
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I have great difficulties watching Papavideos ........ I'm laughing at least half of time , so must watch it several times to get everything

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Old 11th February 2019, 12:02 AM   #1649
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by lae2 View Post
A candidate if I could match it with a P channel.
I believe answers are already there .......
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Old 11th February 2019, 04:09 AM   #1650
lae2 is offline lae2  United States
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I got itchy and ordered a few pairs of IXTH20P50P and IXTH30N60P. The capacitance and transconductance appear comparable relative to other documented push/pull pairs.

Last edited by lae2; 11th February 2019 at 04:14 AM.
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