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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th June 2013, 02:26 PM   #11
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This sounds like its a PA amp judging from the rail voltages. Depending on what transistors were used, repairing it might be more than getting a new amp.

Did it just decide one day that it dident wanna live anymore and committed suicide or did it happen by accident such as a unintentional short of the speaker outputs while at moderate output power ?
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Old 11th June 2013, 03:09 PM   #12
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"Did it just decide one day that it dident wanna live anymore and committed suicide or did it happen by accident such as a unintentional short of the speaker outputs while at moderate output power ? "

It was during some tests with no speakers connected that my DSP put out garbage at full level +20dBu that killed the amp.
Don't think the transistors are that expensive - guess that 8 or 10 of the are short. 2SC5359 / 2SA1987
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Old 11th June 2013, 03:43 PM   #13
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A good design should survive a full +20dBu signal with no load no problem as it is essentially the same thing as turning your hifi to full volume with no speaker connected, never seen a home amp fail from that. I have even done it into loads well below the manual "absolute minimum load" witn no problems.

I would guess your amp was already on death row before this, ie already failing(like a bias circuit starting to go bad causing thermal runaway) where the full volume input was all needed to send it over the edge.
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Old 11th June 2013, 04:36 PM   #14
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...should survive.... but for an 14 Years old amp there is no guarantee...
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Old 11th June 2013, 04:40 PM   #15
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Yeah like i said, was probably already at its left leg and that input was enough to send it over the edge.

It could possibly also be one of those designs that without load jumps into uncontrolled oscillations beyond a certain output level causing instant destructive failure.
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Old 27th August 2013, 10:40 AM   #16
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The issue is "solved". I ve scrapped the old amp (anybody here needs TO247 complementary Power Bipolars for cheap? Or a big 50Hz toroid?), bought and installed a Class H Camco D Power 2. System is running again.
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Old 28th August 2013, 12:31 AM   #17
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The nearest IC I could find is the irs2092 which can cope with 220 volts max.
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Old 28th August 2013, 12:48 AM   #18
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I didn't see it mentioned here, but you would have some serious bus pumping issues running half-bridge at those power levels anyway.
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Old 1st September 2013, 07:08 PM   #19
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Quote:
Originally Posted by theAnonymous1 View Post
I didn't see it mentioned here, but you would have some serious bus pumping issues running half-bridge at those power levels anyway.

+/-120 V DC Class D Modules are available

digitclass.net

TN5000 SPECIFICATIONS:
850 W @ 8 ohms (+/-125V)
1,450 W @ 4 ohms (+/-125V)
2,550 W @ 2 ohms (+/-125V)


1,070 W @ 8 ohms (+/-140V)
2,030 W @ 4 ohms (+/-140V)
2,700 W @ 2.66 ohms (+/-140V) (ไม่แนะนำกรณีใช้งานจริง)

Input Impedance : 47k ohms unbalanced
Frequency Response : 20 Hz - 20 kHz
Supply Voltage : +/-75V to +/-140V
Bias : Include


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Old 1st September 2013, 09:02 PM   #20
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The website is slow with strange letters and I couldn't find any datasheet. But still - an option to get my Sony amp working again.
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