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

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

• 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
• In reply to Shawn Zheng:

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

• In reply to domenyko:

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
• In reply to Dylan Yao:

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
• In reply to domenyko:

Hi Domenico,

Sorry the late reply, please see below plot of Pout@1%THD VS PVDD.

Dylan

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