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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th May 2006, 05:56 AM   #21
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will probably sell you. But beware of the price.
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Old 10th May 2006, 06:50 AM   #22
IVX is offline IVX  Russian Federation
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Eva, IRFP460 have Trr(typical) =570nS, but for IRF740A Trr(typical) =240nS, i tried IRF740A, IRF740LC in the 370V 100KHz Dead-Time<500nS H-bridge class D (2X ir2110), however good efficiency was obtained only by SiC using. I bought some ST mosfets (STP12NM50D and others with D suffix, looks like World fastest body diode mosfets), but about 20 smoked/shorted of the IRF740LC cry me -don't do it!
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Old 10th May 2006, 03:05 PM   #23
Pafi is offline Pafi  Hungary
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Jaka!

Thanks, but I don't really need any APT device at this moment. I've found more suitable and cheaper devices accessible in my city.


Quote:
Try to figure out first
I tried, but I don't want to check all of the manufacturers. IR, Fairchild, APT done, Siemens is hiding.
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Old 10th May 2006, 05:18 PM   #24
Eva is offline Eva  Spain
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Tip: My devices are from Infineon/Siemens (the first one to make such switching gems available, I think). How is it hiding?

Don't be lazy, I found these and other nice devices after checking one or two hundred datasheets one by one. There doesn't seem to have any other way to do it.

BTW: I don't need APT products either, I think that I can build entire switching power supplies or class D amplifiers costing less than one of their MOSFETs
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Old 10th May 2006, 08:04 PM   #25
Pafi is offline Pafi  Hungary
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Lazy? Thanks! Why do you think I haven't red 377 datasheet of transistors? I have. At least. This is only the number of ones I found worth to save.

I thought about Siemens, (high voltage drop and positive TK is typical) but I didn't find their relevant homepage. I searched in siemens.com, but there is absolutely nothing about semiconductors. Where is their parts list??? Don't they want sell any?
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Old 10th May 2006, 08:05 PM   #26
mzzj is offline mzzj  Finland
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Quote:
Originally posted by Pafi
Lazy? Thanks! Why do you think I haven't red 377 datasheet of transistors? I have. At least. This is only the number of ones I found worth to save.

I thought about Siemens, (high voltage drop and positive TK is typical) but I didn't find their relevant homepage. I searched in siemens.com, but there is absolutely nothing about semiconductors. Where is their parts list??? Don't they want sell any?
Try Infineon website
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Old 10th May 2006, 08:07 PM   #27
Pafi is offline Pafi  Hungary
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Don't laugh! I found it on www.infineon.com
Stupid habit of renaming.
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Old 10th May 2006, 08:15 PM   #28
Pafi is offline Pafi  Hungary
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Thank You! You are very helpful, and quick too! :-)
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Old 10th May 2006, 08:31 PM   #29
mzzj is offline mzzj  Finland
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Quote:
Originally posted by Pafi
Jaka!


I tried, but I don't want to check all of the manufacturers. IR, Fairchild, APT done, Siemens is hiding.

IRF: Warp and WarpII series.
Fairchild: SMPS and SMPS2 series.
Infineon: HighSpeed-igbt's

All of above show pretty much same performance on paper. And then there is APT's igbt's ...more expensive tough.
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Old 10th May 2006, 09:32 PM   #30
Eva is offline Eva  Spain
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Check also TrenchStop series. They feature conduction losses as low as for the classic standard speed IGBTs with 2us current tail, but now featuring 40ns current tail!! They seem to be a step ahead of the competitors.

All IR warp series seem a bit outdated because they are not available with integrated diode and Vce(sat) is in the 3V range. Sometimes higher conduction losses counteract any improvement on fall times.

Be aware of very high voltage drop across built-in diodes with some manufacturers, that may also counteract the beneficial effects of faster reverse recovery in some applications.

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