TAS5421-Q1: Expected THD driving 15W in a 8ohm load with 18V of power supply

domenyko

Genius 9655 points

Part Number: TAS5421-Q1

Dear all,

One of my AA is going to use the TAS5421-Q1 to drive 15W in 8 ohm load. The TAS5421-Q1 will be supplied with 18V.

From voltage output point of view it seems that the TAS5421-Q1 should have the headroom to drive the 8ohm @15W.

Which could be the expected THD+N ? The application require a THD+N less than 1%.

regards,

Domenico

over 5 years ago

0 Shawn Zheng over 5 years ago

TI__Mastermind 24835 points

Hi Domenico,
For 8Ohm load and 18V power supply, the output is still not clipped at 15W output power. According to my experience the THD should be far less than 1% in this case.
Best regards,
Shawn Zheng

0 domenyko over 5 years ago in reply to Shawn Zheng

TI__Genius 9655 points

Hi Shawn,

thanks for the prompt answer. Is there any characterization like the one present in fig.5 of the Datasheet for 8ohm case that I can share with the customer?

regards,

Domenico

0 Dylan Yao over 5 years ago in reply to domenyko

TI__Genius 9140 points

Hi Domenico,

We don’t have 8ohm plot on hand, need to measure the data on bench. Before that, may I confirm some information with you.
1. Usually we talk about 8ohm @ 15W, it means it can output 15W at 10%THD condition. It this the same meaning?
2. THD under 1%THD requirement should be tested under 1W or 5W?

Dylan

0 domenyko over 5 years ago in reply to Dylan Yao

TI__Genius 9655 points

Hi Dylan,
the requirement of the customer is THD less or equal to 1% at Po=15W in 8ohm. I did a typo when I wrote THD+N. The customer is fine with a graph like the one in figure 5 for 8ohm load and parameter THD=1%.

regards,
Domenico

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TAS5421-Q1: Expected THD driving 15W in a 8ohm load with 18V of power supply