TAS5431-Q1: State of MUTE pin during Standby

Chirag Patel1

Part Number: TAS5431-Q1

Tool/software:

Hello,

According to TAS5431 datasheet, the MUTE pin should be asserted LOW when the device is in Standby (i.e STANDBY/ pin = LOW = Amplifier Disabled).

Is there any issue if we keep the MUTE pin HIGH during Standby?

Thanks

Chirag

3 months ago

0 Gregg Scott 3 months ago

TI__Mastermind 45045 points

Chiraq,

If you keep the MUTE pin high during a Standby there can be a leakage path to the BYP pin. This extra current may not meet the turn off current for the system spec. I would suspect that the long-term shutdown would have the 3.3Vdc shutdown for the pull up on the MUTE pin.

Regards,
Gregg Scott

0 Chirag Patel1 3 months ago in reply to Gregg Scott

Prodigy 100 points

Thanks Gregg!

Also, currently we bring the Amp in/out of Standby while Amp is muted as shown below to avoid Audio pop issues. Do you agree with the following sequence?

0 Gregg Scott 3 months ago in reply to Chirag Patel1

TI__Mastermind 45045 points

Chiraq,

This is how we would like to see it. For long term off periods, the 3.3Vdc supply should be off so the MUTE pin will not be pulled up.

Regards,
Gregg Scott

0 Chirag Patel1 3 months ago in reply to Gregg Scott

Prodigy 100 points

Hi Gregg,

Currently we have 100K pullup to 3.3V on MUTE pin to limit the leakage current. I will plan on removing this pull-up but would like to understand what leakage path it takes internally.

Thanks

Chirag

0 Shadow He 3 months ago in reply to Chirag Patel1

TI__Mastermind 49430 points

Hi Chirag

MUTE pin doesn't have internal pull up or pull down, only FET off state leakage, smaller than 1uA.

0 Chirag Patel1 3 months ago in reply to Shadow He

Prodigy 100 points

Hi Shadow,

What i meant to say is that we have external 100k pullup to 3.3V on MUTE pin. So i assume leakage will be in nano Amps range, is that right?

Thanks

Chirag

0 Shadow He 3 months ago in reply to Chirag Patel1

TI__Mastermind 49430 points

Hi Chirag

Yes, correct.

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TAS5431-Q1: State of MUTE pin during Standby