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TDA7350 in bridge mode - sending constant 4V though output!?!
TDA7350 in bridge mode - sending constant 4V though output!?!
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Old 10th March 2008, 07:10 PM   #1
minifly is offline minifly  South Africa
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Default 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...

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Old 11th March 2008, 03:43 AM   #2
Leolabs is offline Leolabs  Malaysia
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If the voltage between pin-8 and pin-10 is near zero,then it's ok.
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Old 12th March 2008, 06:11 AM   #3
DigitalJunkie is offline DigitalJunkie  United States
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I'm not sure what to tell ya,The bridge application worked out great for me.

Here's the schematic of my version;
Click the image to open in full size.
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