TPA2005D1: TPA2005D1 FEEDBACK

Ashley Kumar

Part Number: TPA2005D1
Other Parts Discussed in Thread: TPA6211A1

I wanted to get a feedback loop from amp TPA2005D1 to set a digital potentiometer to vary the output db through software.

As this TPA2005D1 is got internally feedback circuit built in.

Is it possible to built a feedback ref circuit externally ? I need a output db (Low-High) ref to feed in software to adjust the volume.

over 3 years ago

0 Luis Fernando Rodriguez S. over 3 years ago

TI__Guru* 84915 points

Hi, Ashley,

Welcome to E2E and thank you for your interest in our products!

Unfortunately, the feedback circuit cannot be performed in this case. However, have you considered to vary the input resistor in order to adjust the gain? It can be as low as 15Kohms and the output gain will be defined by the formula 2 x (150K/Ri).

Best regards,
Luis Fernando Rodríguez S.

0 Ashley Kumar over 3 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 20 points

Thanks Luis

Gain is not issue here.

I made a stereo amp using these 2xmono amp.

Result is really acceptable with 5V supply range.

This circuit is for public kiosk 65db range.

I am trying to do automatically adjusting out put when background noice is high.

For that I need a reference output sample to feedback.

I could not find a feedback amp in 5V range.

Thanks again

0 Luis Fernando Rodriguez S. over 3 years ago in reply to Ashley Kumar

TI__Guru* 84915 points

Hi, Ashley,

Have you considered to try with the TPA6211A1? This device has the internal feedback resistor directly from the Vo to IN pins. This kind of architecture allows another feedback circuitry externally.

Best regards,
Luis Fernando Rodríguez S.

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TPA2005D1: TPA2005D1 FEEDBACK