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Class D Switching Power Amplifiers and Power D/A conversion

Have on order car amp PPI P900.4 -> 4x100w 4 ohms w/12v, under 0 new....
Have on order car amp PPI P900.4 -> 4x100w 4 ohms w/12v, under 0 new....
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Old 25th February 2013, 10:56 PM   #11
turbodawg is offline turbodawg
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Ok, curiosity got the best of me. I took mine apart.

Guess what... I was right the first time! The amp is IRS2092 based with one piece per channel.

Power supply fets are AOT460 if that matters to anyone.
Awesome! So what do you think of the implementation....good, bad or ugly? How is the smt fab, board layout, and parts quality? Anything different about it vs. other designs?

Last edited by turbodawg; 25th February 2013 at 11:00 PM.
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Old 26th February 2013, 02:01 PM   #12
theAnonymous1 is offline theAnonymous1  United States
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I'm not really qualified to pass judgement on the design, although I see a couple things that don't look right.

Local supply decoupling seems inadequate. There should be something like 330uF-470uF near the output fets for each channel, but the only electrolytics are the two 3300uF bulk caps by the supply transformer. I assume they didn't include them because of space limitations.

The crosstalk is supposedly poor (30dB @ 1kHz?). I forget where I read that, it's not in the manual. There's an input filter that might be partly to blame. The L/R input signals wrap around the same ferrite toroid.

There'se also a few spots with components missing , which makes you ask "why"?

Overall build quality is decent. I guess as long as it works I have no real complaints.

Since I already have the thing apart, I might replace the 10x TL072 with OPA2132.
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Old 26th February 2013, 02:09 PM   #13
Pallas is offline Pallas  Pakistan
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There'se also a few spots with components missing , which makes you ask "why"?
Maybe they use the same board for the 5-channel variant?
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Old 26th February 2013, 02:28 PM   #14
theAnonymous1 is offline theAnonymous1  United States
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No, looks like some missing R/C zobel parts.
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Old 28th February 2013, 06:27 PM   #15
turbodawg is offline turbodawg
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So, my amp came in, so far it looks pretty heavy and well enough made for $187. Also got the sla battery. Might get a chance to set it up tonight and run it a bit.
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