TAS6424EQ1EVM: TAS6424EQ1EVM Line-out DC Load Diagnostics

Hi Derek,

Thanks for your answer~

Are the values correct in the figure?


I have another question.
Will the DC Load Diagnostics Threshold be changed after using it for a long time, in a high-temperature environment, or other affected?
Does TI give any guarantee or any other limit?

Best regards,
Jeffery.

Hi Derek, 

I think this figure would be correct.

Here has another related issue.

I used to use 14V as the PVDD, and the DC diagnostics thresholds are close to the datasheet value, but after I changed the PVDD from 14V to 5V, the value would be different.

The most different thing is the OL max when line-out is disabled.

1.PVDD=14V, Line-out disabled, OL Max measurement=70ohm

2.2. PVDD=5V, Line-out disabled, OL Max measurement=390ohm

Is this correct?

Best regards,

Jeffery.

Is it means the voltage would affect the tolerance?

What if used for more than five years or ten years? Will the tolerance get worse?

And I also find this information in datasheet.

The OL detection threshold is 40~70 ohm, but the datasheet said the external amp resistance should be between 600 ohm and 4.7k ohm.
If our external amp resistance is 300 ohm, can this external amp be used on TAS6424E-Q1?
I tried 300 ohms on the TAS6424E-Q1 EVM, which can be detected as the line-out. So I think it can be used, but I do not know if it will have any potential risk.

Best regards,

Jeffery.

Hi Derek,

This is the result that I use 4 ohms for channel 1~3 and use 300 ohms for channel 4 when the "line-out enable diagnostics" is enabled.

Is it means 300 ohms can be detect?

Regards,

Jeffery.

Hi Derek,

I want to ensure this result means channel 4 detects the external amplifier, right?

.

When the impedance between 70~600 ohm and line-out diagnostics is enabled, what should it be?

My experiment will always report that the line-out is detected, not open-load.

.

According to the figure10-1, it said the external impedance should be between 600~4.7kohm.

But the spec in the datasheet said Line-output 6k ohm. What is it means?

.

Regards,

Jeffery.

Hi Jeffery.

Derek is out of office today, he will reply you when he is back.

BR. 

Wei Qiu.

Hi Jeffery

    In the table, the 6Kohm means the load diagnostic can test out the largest value is around 6Kohm. Larger than this one will be reported as open-load. The load diagnostic range leaves some margin for real using range.