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Old 30th December 2012, 02:35 PM   #1
danny92 is offline danny92  Portugal
diyAudio Member
Join Date: Nov 2012
Location: Lisbon
Default TDA7375V instabilities

Hi everyone,
I'm using a TDA7375V in a breadboard, and seems to be a very good chipamp, the separated grounds are very good to use with a separated preamp. The problem I'm talking about occurs when the volume is raised, when the amplifier enter clipping it starts turning on and off quickly making strange noises. I'm using a 3 K/W heatsink. This also occurs with other power supplies.
Could be a problem in the built in protection system?
Thank you very much for your atention,
Best regards,
Daniel Almeida

Last edited by danny92; 30th December 2012 at 05:04 PM.
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Old 1st January 2013, 03:20 PM   #2
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Sounds like the power supply decoupling capacitor is not close enough to the chip and/or the small signal ground has higher currents flowing in it from the power supply ground lead. BTL amplifier chips are very touchy with ground layout.
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Old 1st January 2013, 06:07 PM   #3
danny92 is offline danny92  Portugal
diyAudio Member
Join Date: Nov 2012
Location: Lisbon
Thank you very much for the repply,
Do you think I should try to mount this amp on a PCB layout, the problem is that I tried almost everything in the breadboard even leaving the amp alone and the input directly connected to it without any modules, but it seems to have some problem at the current limiting circuit, but I can be wrong can be a signal injection to ground that is causing this issue.
The problem is that I have broken a pin in the IC and I don't have any TDA7375V actually now I'm using TDA7297, but STA540 is similar isn't it. I think that's easier for me to buy TDA7375V, but I'm afraid of instabilities even in a PCB layout. I don't have PCB expereence .
Best regards,
Daniel Almeida
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Old 1st January 2013, 06:16 PM   #4
Mooly is offline Mooly  United Kingdom
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Join Date: Sep 2007
Hi Danny,
I was going to say its like a similar thread I saw the other day... and it is... yours

Same answers I'm afraid. Attend to layout, grounding and so on and the problems dissappear.

That probably doesn't sound like much help but you have to walk before you can run.

Although its no real answer have you tried connecting the speaker return back to the power supply rather than via the breadboard (if thats how you have it now) ?
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