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Class D Switching Power Amplifiers and Power D/A conversion

Project issue: output power of a Class-D 2*100W
Project issue: output power of a Class-D 2*100W
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Old 25th March 2011, 02:30 PM   #1
Kellindil is offline Kellindil
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Join Date: Nov 2010
Default Project issue: output power of a Class-D 2*100W

I'm working on a 2*100W Class D amplifier DIY project and got some problems.
I've tested it with a 1kHz sine wave input as well as some musics.
It started to distort with a 11V RMS output(30W@4ohm). This is far away from the 75W@1% THD which mentioned in the datasheet of the chip.
At the same time, the output inductors on board began to make noises which would raise up when I increased the output power.
If speakers are connected, I could hear pops from it.

Does anyone have any ideas about the issue? Thanks a mmmmmmillion!
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Old 25th March 2011, 05:39 PM   #2
Pafi is offline Pafi  Hungary
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Join Date: May 2004
Location: Budapest
My idea: something is wrong.

Do you really think anybody can tell you the problem from almost zero information?

Can be the inductor (saturating), insufficient power supply filtering, faulty overcurrent setting, bad layout, etc...
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Old 26th March 2011, 11:36 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Join Date: Apr 2008
Location: Carlisle, England
Could be a power supply problem?
Which class d chip are you using or is it discrete ?
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
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