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Class D Switching Power Amplifiers and Power D/A conversion

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Old 23rd October 2007, 07:58 AM   #1
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Default fets to class d

Are these suitable for class d amp ?

http://cgi.ebay.com/ws/eBayISAPI.dll...m=170161496855
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Old 23rd October 2007, 09:10 AM   #2
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They would be usable theoretically.

BUT: You won't need FETs that are capable of switching such high currents at this low voltage unless you want to build an amp to drive 1 ohm loads. Keep in mind that the disadvantage of this beefy FET is its high gate-charge and input capacity. So less beefy transistors may be easier to drive.

Regards

Charles
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Old 23rd October 2007, 09:32 AM   #3
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im not sure what to get, IRF640 ?
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Old 23rd October 2007, 11:05 AM   #4
Dalus is offline Dalus  Netherlands
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Get some IRFP450 fets they're really easy to drive just over 2 nF gate capacitance. I used them for http://www.youtube.com/watch?v=8SHabqEiUCA
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Old 23rd October 2007, 11:10 AM   #5
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I have 200 IRFP450s but classd4sure said i shouldent bother with them.
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Old 23rd October 2007, 11:59 AM   #6
Dalus is offline Dalus  Netherlands
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I personally think you're fine with them as long as you use a decent gate driver such as http://focus.ti.com/docs/prod/folder.../ucc37321.html
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Old 23rd October 2007, 12:06 PM   #7
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I have a few UCCs (sampled for a tesla coil project) a buncha IR2110s and 4 HIP4080s.
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Old 23rd October 2007, 12:15 PM   #8
Dalus is offline Dalus  Netherlands
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I would just give it a try and build a low power D-amp on a breadboard to see if it works.
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Old 23rd October 2007, 12:16 PM   #9
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I had a low power d-amp working nicely on breadboard using a TC4422 as output device.
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Old 23rd October 2007, 12:27 PM   #10
Dalus is offline Dalus  Netherlands
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I meant with a IRFP450 halfbridge as a output device.
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