TPA3123D2: About the delay of the mute pin

Ryu Yamashita

Expert 2080 points

Part Number: TPA3123D2

Hi team,

The datasheet says that the mute pin has a delay of 120ms when switching, but if it is switched at a high speed (e.g. 100ns), what will be the effect on the IC?

Sincerely.
Ryu.

over 2 years ago

+1 Yanming Gong over 2 years ago

TI__Mastermind 19250 points

Hi Ryu,

What's the high speed means?

TPA3123 switching frequency is 250KHz, it is fixed. audio input will change PWM duty cycle, but not frequency.

Regards,

Derek

0 Ryu Yamashita over 2 years ago in reply to Yanming Gong

Expert 2080 points

Hi Derek,

Thanks for reply.
High speed means that the input to the mute pin is swapped at high speed.

Sincerely.
Ryu.

+1 Yanming Gong over 2 years ago in reply to Ryu Yamashita

TI__Mastermind 19250 points

Hi Ryu,

Mute pin signal is not suggested to high speed. It should wait 120ms at least to mute or unmute output.

Regards,

Derek

0 Ryu Yamashita over 2 years ago in reply to Yanming Gong

Expert 2080 points

Hi Derek,

Thanks for reply.
I know that.
I'd like to know what happens if I do.
Or I'd like to know the Minimum Pulse Width of the MUTE pin.

Sincerely.
Ryu.

+1 Yanming Gong over 2 years ago in reply to Ryu Yamashita

TI__Mastermind 19250 points

Hi Ryu,

If the timing is not suitable, the internal FET may work abnormal. Mute pin has no pluse width requirement, but it should wait 120ms to unmute or mute device again.

Regards,

Derek

0 Ryu Yamashita over 2 years ago in reply to Yanming Gong

Expert 2080 points

Hi Derek,

Thanks for reply.
If the internal FET works abnormally, will it break or will it be affected by noise, etc.?

Sincerely.
Ryu.

+1 Yanming Gong over 2 years ago in reply to Ryu Yamashita

TI__Mastermind 19250 points

Hi Ryu,

Device will not break, device has internal protection logic.

Other risks need to be evaluated.

Regards,

Derek

0 Ryu Yamashita over 2 years ago in reply to Yanming Gong

Expert 2080 points

Hi Derek,

Thanks for reply.
I was able to resolve the original question.
Thank you so much.

However I have an additional question that I would like to reply to.
The 120ms on the MUTE pin is a typ value, do you know what the MAX value is?
This is needed to set the time when switching should not be done.

Sincerely.
Ryu.

+1 Yanming Gong over 2 years ago in reply to Ryu Yamashita

TI__Mastermind 19250 points

Hi Ryu,

It is very hard to deep the max value data. The various should be very low, I think it should be in 10ms.

Regards,

Derek

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TPA3123D2: About the delay of the mute pin