TPA3113D2: TPA3113D2 limit output power

Daniele Cortellazzi1

Part Number: TPA3113D2

Hello,

i'm writing because i have a device developed for us where we use the TPA3113D2 connected to two 1.5W 4ohm speakers. Our problem is that the PVCCR is 5V so the max output power could be (5*5)/4 = 6W and the Vplim is 2.56V. As visible in the datasheet www.ti.com/.../tpa3113d2.pdf , at pag 15 in the chart, this voltage is more or less for a Pout=6W, too.

If i change this R for reach a lower V_PLIM can i limit the power output to 1.5W in this amplifier or i could have many distorsions problem regarding the low power output from this amplifier?

We don't have find speaker with 8ohm impendence with the same dimensions.

Thanks

over 3 years ago

0 Yanming Gong over 3 years ago

TI__Mastermind 19030 points

Hi Daniele,

For 5V PVCC, 4ohm load application, considering Rds and trace power dissipation, the max power should around be 2.4W(1% THD), 3W(10% THD).

If you want to limit the output power to 1.5W, the Vp should be 4.25V, calculated by formula in page 15 of datasheet. So the Plimit is 4.25/4=1.0625V.

Regards,

Derek

0 Daniele Cortellazzi1 over 3 years ago in reply to Yanming Gong

Prodigy 30 points

Hello Derek,

i have the same result

Thanks!!

0 Daniele Cortellazzi1 over 3 years ago in reply to Yanming Gong

Prodigy 30 points

Excuse Me, last question. This power limitation on the signal (so the amplitude reduction) is applied only when we go upper the power output configured? right?

Thanks

0 Yanming Gong over 3 years ago in reply to Daniele Cortellazzi1

TI__Mastermind 19030 points

The output power can not reduce auto if touch the max power. Plimit feature only set the max output power.

Derek,

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TPA3113D2: TPA3113D2 limit output power