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Class D Switching Power Amplifiers and Power D/A conversion

Need help with TAS56**
Need help with TAS56**
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Old 13th July 2011, 11:32 AM   #1
ghabrius is offline ghabrius  United States
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Default Need help with TAS56**

Hello. I've recently made an amp with TAS5611PHD according to schematic in the datasheet.

Now the amplifier works fine and all but when it tries to play some heavy bass all high frequency sounds attenuate a lot. Maybe thats what all class D amps do? I tried placing different output inductors and caps and still works pretty much the same.

Also I have another problem with the amp; datasheet doesn't even mention what kind of input that chip needs so I just connect the signal source right to the IC (through caps of course) and when the signal source is a DVD player or a computer, the amp kicks into the shutdown mode (protection). So basically I can't connect anything to the amp but an mp3 player. Maybe the TAS5611 needs two differential preamps before it, just like in the evaluation board?

Also what could be the gain of the amp? I seems like it only gives like 10W from a 1Vp-p source.


TAS5611 DATASHEET
http://focus.ti.com/lit/ds/symlink/tas5611.pdf


EVALUATION BOARD DATASHEET
http://focus.ti.com.cn/cn/lit/ug/slou286/slou286.pdf
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Old 13th July 2011, 11:59 AM   #2
Ipanema is offline Ipanema  Malaysia
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I've burned a TAS5630 module when the input signal is too large. I think the limit is mentioned in the datasheet. Also check the clipping indicator.
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Old 13th July 2011, 12:01 PM   #3
marce is offline marce  United Kingdom
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Is your board a single copper sided design, it looks like it, but its hard to tell.
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Old 13th July 2011, 02:20 PM   #4
ghabrius is offline ghabrius  United States
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its a double-sided board..
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