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Class D Switching Power Amplifiers and Power D/A conversion

Berihnger A800 full review, pictures INSIDE )
Berihnger A800 full review, pictures INSIDE )
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Old 14th November 2019, 01:43 PM   #11
MorbidFractal is offline MorbidFractal
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Package is a guess. Given it is IRS20957 based then chances are it is self oscillating per the Infineon application note and the words spew from that. As long as the drive waveform integrity is maintained then any additional, matched to avoid cross conduction, delay becomes part of the loop. UCD is very forgiving...
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Old 14th November 2019, 02:38 PM   #12
FauxFrench is offline FauxFrench  France
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Interesting to see how a moderately priced, high-level consumer product is actually made.

I guess the power FETs are cooled to the aluminum bottom plate?
The two 1200uF/200V caps are put in series for 230V supply?
The power converter works flyback?

Good photos. Rather logical layout with low production costs.
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Old 14th November 2019, 03:31 PM   #13
kipman725 is offline kipman725  United Kingdom
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Quote:
Originally Posted by HemiRick View Post
I see this amp has "SmartSense Impedance Compensation
Our new SmartSense Technology puts the punch back into Class-D amplification, providing vastly improved full-range frequency response with more powerfully-dynamic bass, and smoother high-frequency reproduction. The resulting output is no longer dependent on the actual load, but is rendered perfectly ruler flat via impedance compensation. A800's design also incorporates a significantly-higher damping factor that yields better amplifier control over the loudspeaker for stronger audio reproduction especially in the LF area."

Any comment on what this actually is? How it works? Or more BS?
Post filter feedback (a good thing if implemented correctly) with BS sprinkled on it.
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Old 23rd November 2019, 09:45 AM   #14
Baldin is offline Baldin  Denmark
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Quote:
Originally Posted by deChrLam View Post
Driver irs20957s
Mosfet??? What is under the funny heat clips?


The layout has decoulping caps miles away from the pins in the ICs.
I guess they think it is important to organise the board in rows and columns and leave plenty of space between pins and caps for the labels.
I think the clips are to force the MosFets on the underside of the PCB either just to the bottom plate or to some other kind of heatsink.
The fets does not appear to be DirectFets, as you can clearly see 2 x 3 legs sticking through the pcb probably from TO220 fets on the underside
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