TAS5825M: Low output power

zhou junjun

Part Number: TAS5825M

I used TAS5825M EVM to test the output power of more than 20W, but the output power on my engineering board was only about 5W.

The register was referred to that on the EVM board.

The specific configuration is as follows.

Could you tell me what caused it?

{ 0x01, 0x00 },//Reset DSP and Registers
{ 0x02, 0x00 },//BD MODE
{ 0x50, 0x00 },
{ 0x60, 0x07 },
{ 0x61, 0x0b },
{ 0x62, 0x03 },
{ 0x63, 0x08 },
{ 0x03, 0x12 },
{CFG_META_DELAY, 0x05},//sleep 5ms
{ 0x03, 0x03 },

Thanks.

over 6 years ago

0 Alix Wan over 6 years ago

TI__Genius 9995 points

Hello Junjun,

Can you refer to the gain structure part of this application note?

http://www.ti.com/lit/an/slaa894/slaa894.pdf?ts=1590546535635

Then you can use PPC3's analog gain and volume to do power tuning.

BR.

Alix Wan.

0 zhou junjun over 6 years ago in reply to Alix Wan

Prodigy 70 points

Hi Alix

The situation is this, I use PPC3‘s debugging EVM，the power is normal

0 Alix Wan over 6 years ago in reply to zhou junjun

TI__Genius 9995 points

Hi Junjun,

Then please use PPC3 to dump complete header file or cfg file for software integration.

It is not recommended to do modification as power on sequence is integrated in the dumped file. Your configuration code above is not recommended.

After your obtaining this configuration file, then please do the I2C initialization by follow the power on sequence as below:

TAS58x5 -Introduction of Register Map and Power on Sequence.pdf

BR,

Alix Wan.

0 zhou junjun over 6 years ago in reply to Alix Wan

Prodigy 70 points

Hi Alix ,

According to your suggestion, I used PPC3 to export the header file. The input sampling rate was As input, and the audio mode was Base mode. All other configurations were default.

But there is no output sound on my own development board, and the state of register 0x68 is 0x03.

My application is a sample rate of 32k. Below is the header file I exported.

Is there anything else I have missed?

Thank you!

tas5825m(1).h

0 zhou junjun over 6 years ago in reply to zhou junjun

Prodigy 70 points

In addition, there are no optional books or pages on the datasheet.

0 Alix Wan over 6 years ago in reply to zhou junjun

TI__Genius 9995 points

Hi Junjun,

As to books/page, please refer to appendix of this application note: https://www.ti.com/lit/an/slaa786a/slaa786a.pdf?ts=1591074359608

As to the reasonable why no sound comes out, 0x68=0x03 indicates output of TAS5825 should be ok. You can scope the waveform before inductor to see whether a PWM waveform can be seen.

Then, if PWM can be found, you should check your configuration. Please share .ppc3 file rather than the header file for double check.

BR.

Alix Wan.

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TAS5825M: Low output power