TPA3138D2: How to set the Plimit for TPA3138D2 ?

Tony Jin

Prodigy 30 points

Part Number: TPA3138D2

Hi there ,

I am using TPA3138D2 with 3W speaker and the PVCC is 8V, do you have suggestion for the Plimit configuration ?

Thanks

Tony

over 6 years ago

0 Yanming Gong over 6 years ago

TI__Mastermind 19820 points

Hi Tony,

What's the load impedance?

For 4ohm load, according to the Rson and Rtrace, the Vpp of the output should be 5.5V for 3W.

The Vpp of the output is approximately 5.7 times (with BD mode) and 11.4 times (with 1SPW mode) the voltage at the PLIMIT pin.

So the voltage at the PLIMIT pin should be 0.965V

Regards,

Derek

0 Tony Jin over 6 years ago in reply to Yanming Gong

Prodigy 30 points

Hi Derek ,

Thanks for your quick reply .

The load impedance is 8 ohm , so the VPP of output should be 7.3V

7.3/5.7= 1.28V , the two resistors(10.2K and 2.2K) can be selected to divide the GVDD volatge to make the voltage on the PLIMIT around 1.28V .-am I right ?

Thanks

Tony

0 Yanming Gong over 6 years ago in reply to Tony Jin

TI__Mastermind 19820 points

Hi Tony,

That's ok.

You should consider the trace loss, you can tune the value on EVM board or on your board.

Regards,

Derek

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TPA3138D2: How to set the Plimit for TPA3138D2 ?