ucd 25 watts to 1200 watts using 2 mosfets - Page 41 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd August 2010, 07:48 PM   #401
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YouTube - Prototype class d amp driving 2 ohms
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Old 22nd August 2010, 11:50 PM   #402
Pafi is offline Pafi  Hungary
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I like this music, and congratulation for the recording, but either the switching freq is too small, or the modulation index is not close to maximal.
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Old 23rd August 2010, 06:36 AM   #403
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Its switching in about 260kHz, and i have been unable to get it any higher.

Also the camera doesent really pick up the higher frequencies very well, to my ears it sounds pretty good.
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Old 23rd August 2010, 11:31 AM   #404
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I've now managed to up the frequency to 312kHz by reducing the phase lead network resistors to 100 ohms, the phase lead capacitors are 100pF.

High frequency quality have already improved quite a bit!
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Old 23rd August 2010, 01:55 PM   #405
opor is offline opor  Thailand
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Hi All,

I face some problem . When this amp is in idle, two mosfets is getting warm ander few minute I feel that it is hot. Is something wrong? It should not be.
This is my schematic.
Attached Files
File Type: pdf My IR2110UcD update on 6_6_10.pdf (17.0 KB, 782 views)
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Old 23rd August 2010, 03:51 PM   #406
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What voltages are you inputting on the dc buses ? Im running 2x18VDC and driving a 2ohm load with two IRF540 and my heatsink barely even gets warm enough to feel, and most of that is likely from the 15V regulator on the same sink.
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Old 23rd August 2010, 07:20 PM   #407
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Quote:
Originally Posted by opor View Post
hi all,

i face some problem . When this amp is in idle, two mosfets is getting warm ander few minute i feel that it is hot. Is something wrong? It should not be.
This is my schematic.
tip31c
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Old 24th August 2010, 01:14 AM   #408
opor is offline opor  Thailand
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Hi FELIBAR12,

Yes ,it is tip31c .Becuase it is fit on the same heatsink. Thank you.
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Old 24th August 2010, 01:23 AM   #409
opor is offline opor  Thailand
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And how about coil? Is it also warm under idle ? My power rail is +-70VDC.
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Old 24th August 2010, 06:12 AM   #410
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In 2 ohms my coil gets warm when i turn the volume up, its a 22µH Wurth Elektronik coil rated 5A. A coilcraft toroid stays cool.
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