TPA3251D2EVM: TPA3251D2 Efficiency lower

li darren

Intellectual 520 points

Part Number: TPA3251D2EVM

Hi,

Set TPA3251D2EVM 2.1 mode, Load is 8ohm, test result is as below.

input power, 34.7V*2.9A=100.63W.

output power, 2*(10V*10V/8)+21.5V*21.5/8=87.78W

η= 87.78/100.63=82.26% .

Why is the eficiency so low?

over 6 years ago

0 Robert Clifton56 over 6 years ago

TI__Mastermind 23150 points

Hi Li Darren,

Good question. The EVM has more devices on the board than just the TPA3251. Though the amplifier certainly is consuming the majority of it, you do have some current draw from the onboard op-amps, 12V and 3.3V LDO as well as the buck converter. These devices will be skewing your efficiency numbers.

Regards,

Robert

0 li darren over 6 years ago in reply to Robert Clifton56

Intellectual 520 points

So I subtract DCDC input power and get AMP consume power?

0 Robert Clifton56 over 6 years ago in reply to li darren

TI__Mastermind 23150 points

Yes, if you mean subtracting the power consumed by the LDOs, buck, LEDs, etc from the system power consumption. You can likely find an approximation of how much current the device consumes on their datasheets as well.

Best of luck,

Robert

0 li darren over 6 years ago in reply to Robert Clifton56

Intellectual 520 points

Thanks.

Audio

Audio forum

TPA3251D2EVM: TPA3251D2 Efficiency lower