Hi,
I have a problem with this audio amplifier (i'm new in this field, so
excuse me for my questions):
http://focus.ti.com/lit/ds/symlink/tpa2005d1.pdf
I've used it as single ended amplifier. It is connected to a DAC:
between DAC and IN- a CR high pass filter is present.
DAC can generete signals from 0 to Vdd (the same Vdd of TPA2005); so a
value between -Vdd/2 +Vdd/2 is present in IN-. From datasheet i can
obtain a value between -Vdd/+Vdd at loudspeaker; so i've decided a
gain=2 for ampifier. Audio sounds well, but loudspeaker's volume is
very low....where is the problem?
Thanks in advance

On Sep 16, 7:24=A0am, eryer <idkfaidkfaid...@gmail.com> wrote:
> Hi,
> I have a problem with this audio amplifier (i'm new in this field, so
> excuse me for my questions):http://focus.ti.com/lit/ds/symlink/tpa2005d1.=
pdf
> I've used it as single ended amplifier. It is connected to a DAC:
> between DAC and IN- a CR high pass filter is present.
> DAC can generete signals from 0 to Vdd (the same Vdd of TPA2005); so a
> value between -Vdd/2 +Vdd/2 is present in IN-. From datasheet i can
> obtain a value between -Vdd/+Vdd at loudspeaker; so i've decided a
> gain=3D2 for ampifier. Audio sounds well, but loudspeaker's volume is
> very low....where is the problem?
> Thanks in advance

Do you establish a common mode voltage on one of the resistors inputs,
then AC couple to the other? I am assuming you drive it single ended,
but use the bridged output .Otherwise you would have DC going through
the speaker.

On 16 Set, 21:18, "m...@sushi.com" <m...@sushi.com> wrote:
> Do you establish a common mode voltage on one of the resistors inputs,
> then AC couple to the other? I am assuming you drive it single ended,
> but use the bridged output .Otherwise you would have DC going through
> the speaker.

Thanks for the answer...
I'm using configuration in Figure 34 of pag.11 of datasheet
http://focus.ti.com/lit/ds/symlink/tpa2005d1.pdf
I've done these calculations
1. GAIN=2 => Ri=150Kohm
2. high pass corner frequency=321Hz => Ci=3.3nF
I think there is a DC in the speaker (because it is very hot), but i
don't understand what's wrong...
Thanks