TDA7350 in bridge mode - sending constant 4V though output!?!

minifly · 10th March 2008, 06:10 PM

I'm fairly new to the whole amplifier game, so I decided to use chips that gave good sound in an old Altec Lansing Hi-Fi system I had, the TDA7350. I've followed the bridge test application circuit on the datasheet, but I'm getting a constant 4V across the outputs on top of the amplified output. If I put a 1000uF electrolytic in series with the speaker/load I get fairly good output, but with more static than I'd like. From the datasheet, and what I've read, in bridge mode the circuit shouldn't require a capacitor anyways.

Have you got any ideas for what might be wrong? I've gone over my veroboard for logic errors and dry joints about 10 times now...

Thanks.

Leolabs · 11th March 2008, 02:43 AM

If the voltage between pin-8 and pin-10 is near zero,then it's ok.

DigitalJunkie · 12th March 2008, 05:11 AM

Hmm,

I'm not sure what to tell ya,The bridge application worked out great for me.

Here's the schematic of my version;

10th March 2008, 06:10 PM	#1
minifly diyAudio Member Join Date: Mar 2008	TDA7350 in bridge mode - sending constant 4V though output!?! I'm fairly new to the whole amplifier game, so I decided to use chips that gave good sound in an old Altec Lansing Hi-Fi system I had, the TDA7350. I've followed the bridge test application circuit on the datasheet, but I'm getting a constant 4V across the outputs on top of the amplified output. If I put a 1000uF electrolytic in series with the speaker/load I get fairly good output, but with more static than I'd like. From the datasheet, and what I've read, in bridge mode the circuit shouldn't require a capacitor anyways. Have you got any ideas for what might be wrong? I've gone over my veroboard for logic errors and dry joints about 10 times now... Thanks.

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11th March 2008, 02:43 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	If the voltage between pin-8 and pin-10 is near zero,then it's ok.

12th March 2008, 05:11 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Hmm, I'm not sure what to tell ya,The bridge application worked out great for me. Here's the schematic of my version;