Project issue: output power of a Class-D 2*100W

Kellindil · 25th March 2011, 02:30 PM

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!

Pafi · 25th March 2011, 05:39 PM

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...

nigelwright7557 · 26th March 2011, 11:36 PM

Could be a power supply problem?
Which class d chip are you using or is it discrete ?

25th March 2011, 02:30 PM	#1
Kellindil diyAudio Member Join Date: Nov 2010	*Project issue: output power of a Class-D 2100W** 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!

26th March 2011, 11:36 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Could be a power supply problem? Which class d chip are you using or is it discrete ? __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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25th March 2011, 05:39 PM	#2
Pafi diyAudio Member 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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