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Class D Switching Power Amplifiers and Power D/A conversion

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Old 21st December 2011, 09:03 AM   #921
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The terminal which is driven is usually called "the signal" and the reference terminal is usually called "ground". I'm on a crusade against this terminology because both are signal terminals, except that in the case of single-ended outputs only one is "hot" i.e. driven by a circuit. The other is called "cold".

The data sheet is being put online as we speak, there's quite a bit of text and drawings in there.
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Last edited by Bruno Putzeys; 21st December 2011 at 09:06 AM.
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Old 21st December 2011, 09:03 AM   #922
back is offline back  Greece
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Originally Posted by matjans View Post
Ah, you got me, mixing up differential with symmetric. My humblest apologies.
Point is that many people (including me) mix up terminology. Differential, balanced, symmetric etc.

Thanks for pointing that out.
know it makes sense.
i made the same mistake.
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Old 21st December 2011, 09:24 AM   #923
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A diifferential input on an power amplifier, fed from a single-ended output on the pre-amp still keeps most of the advantages, provided that you use the correct screened twin-core cable for the connection. Connect the signal output of the pre-amp to the 'hot' wire in the cable, with the 0V output of the pre-amp connected to the 'cold' wire. The screen of the cable should be connected to the ground of the pre-amp. Common-mode noise picked up by the cable will be rejected by the differential input of the amplifier as both the 'hot' and 'cold' inputs will see the same noise signal (as common mode). The wanted signal from the pre-amp will appear as a differential signal across the 'hot' and 'cold' inputs of the power amp.
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Old 21st December 2011, 11:22 AM   #924
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datasheet: http://www.hypex.nl/docs/NC400_datasheet.pdf
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Old 21st December 2011, 11:53 AM   #925
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just took a brief look. no-one mentioned the MCU yet. does it have temperature monitoring too? that would be nice.
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Old 21st December 2011, 11:59 AM   #926
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And my NC400 and SMPS600 just arrived. There IS a God.
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Old 21st December 2011, 12:12 PM   #927
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And my NC400 and SMPS600 just arrived. There IS a God.
so stop wasting time on here and get to work
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Old 21st December 2011, 12:19 PM   #928
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Problem is that I *am* at work/the office...... will have to wait until tonight to get them hooked up at home.
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Old 21st December 2011, 12:23 PM   #929
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Problem is that I *am* at work/the office...... will have to wait until tonight to get them hooked up at home.
making up excuses is not hard...
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Old 21st December 2011, 01:59 PM   #930
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just took a brief look. no-one mentioned the MCU yet. does it have temperature monitoring too? that would be nice.
The firmware flow chart fell off somehow. I'll fix that one of these days. The temperature monitoring is briefly mentioned in chapter 8.

Something not mentioned in the data sheet is that the MCU logs errors. Nothing much but things like "amp turned off because of overvoltage/undervoltage/overtemperature/overcurrent etc" plus the associated readout.
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