TAS5805M: 16V VDD for 15W Output at 4ohm. acceptable?

Hideki Hayashi1

Expert 7460 points

Part Number: TAS5805M

Hi team,

Customer design speaker amp with below condition

Load 4ohm

THD+N 10%

Output power 15W

Can TAS5805M achieve this performance?

Is this graph being indicating "maximum output power"?

Best regards,

Hayashi

11 months ago

0 Shadow He 11 months ago

TI__Mastermind 39490 points

Hi Hayashi

15W 10%THD shouldn't be a problem, as long as your system could provide enough supply voltage.

The picture you showed, is the 1% and 10% THD power VS. supply voltage. To reach 15W 10%THD, better provide 12V supply.

0 Hideki Hayashi1 11 months ago in reply to Shadow He

TI__Expert 7460 points

HI Shadow,

Thank you.

However, customer uses 12V with 4 ohm load, then 14.9W with THD+N = 11%. What can be considered?

LC filter：10uH,0.68uF, Fsw=768kHz, BD modulation.

Please let me know common ways to improver distortion.

Best regards,

Hayashi

0 Shadow He 11 months ago in reply to Hideki Hayashi1

TI__Mastermind 39490 points

Hi Hayashi

We could firstly check on the thermal. The curve in the datasheet is not for long time working, it's short time peak power. If the IC got heat up, the results THD value will increase, for Rdson value increase with temperature.

The other perspective, we could check the Rdc value of inductor, all all of the parasitic resistance value along the PCB trace and cable. There resistor would greatly affect the results.

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TAS5805M: 16V VDD for 15W Output at 4ohm. acceptable?