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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th November 2007, 09:24 AM   #51
h_a is offline h_a  Europe
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@Eva: would you please contact me via email? I would be very interested in your opinion on 1 or 2 things but I cannot reach you via email. Thank you very much!

All the best, Hannes
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Old 8th November 2007, 09:30 AM   #52
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What! Using an expensive E96 range 221 Ohm insread of a low-cost E12 range 220 Ohm?

Bizarre!
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Old 8th November 2007, 12:24 PM   #53
Eva is offline Eva  Spain
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Quote:
Originally posted by h_a
@Eva: would you please contact me via email? I would be very interested in your opinion on 1 or 2 things but I cannot reach you via email. Thank you very much!

All the best, Hannes
I got the mails, but I don't have the simple and clear answers that you are expecting to your questions. Sorry.
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Old 9th November 2007, 10:06 AM   #54
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@Eva: I see! Thank you very much! All the best, Hannes
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Old 5th February 2008, 09:01 AM   #55
Eva is offline Eva  Spain
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Quote:
Originally posted by Ouroboros
What! Using an expensive E96 range 221 Ohm insread of a low-cost E12 range 220 Ohm?

Bizarre!
Who? I swear I didn't


UPDATE:

I have been working in other similar but higher priority projects for the past two months.

However, now I have got plenty of SMD chip capacitors to cut parasitistic inductance and solve the ringing problem, including luxury stuff like 220nF 200V, 100nF 500V, and 220nF 630V (dual chip TDK which I manually split to get two 100nF). I have also developed a new magnetic snubber with much lower winding losses due to eddy currents, much lower shunt capacitance and no longer involving flyback peaks over 2KV. Furthermore, I have developed an active clamp circuit that recovers the energy from magnetic snubber leakage inductance too.

I will apply these new resources to this project as soon as I finish the higher priority stuff. I think that the future is quite promising, for example, with the new magnetic snubber and active clamp the switching frequency may be increased to 200Khz without too high losses.
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Old 5th February 2008, 09:16 AM   #56
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Hi Eva, it seems to be very interest.
btw, what kind of 220nF*620V chip capacitor do you use, who is manufacture? are they 10% precision or better?
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Old 5th February 2008, 10:02 AM   #57
Eva is offline Eva  Spain
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Check the datasheet, TDK P/N is CKG45NX7R2J224M :

http://www.tdk.co.jp/tefe02/e415_ckg.pdf

I got them from RS-Amidata Spain. They were expensive but I needed something rated at 630V.
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Old 5th February 2008, 10:17 AM   #58
IVX is offline IVX  Russian Federation
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Murata make it also (X7R .22/630 GRM55DR72J224KW01L), BTW, film caps SMD .22/630 are exist too.
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Old 5th February 2008, 10:22 AM   #59
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Eva, thank you for infomation.

Hi, Ivan! i've got that murata's GRM55DR72J224KW01L (~1000 in stock ), but they are 10% tolerance .
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Old 5th February 2008, 10:23 AM   #60
Eva is offline Eva  Spain
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Why do you need tight tolerance?

I thought we were talking about supply deocupling capacitors
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