TPA6304-Q1: powerdown Sequence

Eric(Dongguan) Zhu

Intellectual 1450 points

Part Number: TPA6304-Q1

hi,

please tell me the right power-down Sequence for TPA6304Q1. because my customer has pop noise when power down.

thanks

over 1 year ago

0 Shadow He over 1 year ago

TI__Mastermind 31940 points

Hi Eric

Follow below procedure should be fine. Pull down STANDBY will make the device into Hi-Z state, won't causing pop when power supply lost.

0 Eric(Dongguan) Zhu over 1 year ago in reply to Shadow He

TI__Intellectual 1450 points

thanks. My customer use this in EE-infotainment, the power shut down without sending message to MCU and TPA6304. and for pre-market, they need pass the strict test for power-up&down. and I want to know other auto-customer how to design the power-down for TPA6304 to reduce pop noise.

0 Shadow He over 1 year ago in reply to Eric(Dongguan) Zhu

TI__Mastermind 31940 points

Hi Eric

For TPA6304 itself, no other sequence needs to be done. Other customer will try to control from the system level. There should be DAC device generate the audio signal for TPA6304. When power up, give power to DAC first, then power up TPA6304. When shut down, close TPA6304 first, then shutdown DAC. Doing this to avoid the pop signal created by DAC. Make sure there's no audio signal when you want to power up and power down. Try to avoid audio signal suddenly appear or disappear, make it smoothly change.

0 Eric(Dongguan) Zhu over 1 year ago in reply to Shadow He

TI__Intellectual 1450 points

hi Shadow,

please tell the differences about MUTE and STANDBY/ mode?

0 Shadow He over 1 year ago in reply to Eric(Dongguan) Zhu

TI__Mastermind 31940 points

Hi Eric

MUTE only set the output into Hi-Z state. STANDBY will disable most of the internal LDO also analog circuit to save the power.

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TPA6304-Q1: powerdown Sequence