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TPA3116D2: circuit problem

user6280325
Prodigy 60 points
Part Number: TPA3116D2
Other Parts Discussed in Thread: TL431

I have a question: 

Can pin12(mute) be connected to GVDD(Pin 7) through a 100K resistor? please see attached schematic and confirm the Pin12 circuit is correct?

TPA3116 schematic.pdf

  • 0
    TI__Mastermind 19320 points

    Hi,

    We suggest to connect the MUTE pin to external power supply, do not connect the GVDD.

    GVDD is generated by internal LDO, it need some delay when system power up. 

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    Hi Derek,

    This only affects some delays when system power up. So it can still be connected to the mute (Pin12), Is it right?

    Because I have made a lot of goods for the customer, now the customer have to rework on site. because they said the board can not pass ESD. All rework costs are bared by us. The problem for the customer is that this pin12 cannot be connected to GVDD by 100K resistor.

    But I checked the IC datasheet, I saw the Pin12 can connect to GVDD by 100K resistor on page18. please see attached picture.

    I need to know the Pin12 can connect to GVDD, and also connect to PVDD?

    Andy

  • 0 in reply to user6280325
    Prodigy 60 points

    Hi Derek,

    Sorry, I wrote the wrong sentence.

    For the rework fee, the customer needs us to bear all the costs.

  • 0 in reply to user6280325
    TI__Mastermind 19320 points

    Hi,

    We should make sure that the MUTE pin is available when power-up. 

    For the recommended design of the figure 30, because the Fault pin is power-up to AVCC, so the MUTE is high when power-up. 

    GVDD is generated by AVCC. If MUTE is connected to GVDD directly, GVDD need some time delay to be stable when power-up. So connecting MUTE to GVDD, device can not be MUTE when power up.

    Regards,

    Derek

       

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    Hi Derek,

    The customer don't need mute function(no other control, this board is only audio amplifier). so if my circuit has problem(mute connect to GVDD)?

    Now customer asked us to modify the circuit, put the Pin12 connect to Ground directly. How do you think? if the Pin12 connect to ground, will there be other problems?

    Andy

  • 0 in reply to user6280325
    TI__Mastermind 19320 points

    Hi Andy,

    Connecting to GVDD directly has no function problem.

    To avoid the power-up pop noise, I suggest the below sequence:

    When Enable Amp (SDZ High)-------- Mute Amplifier first, Then SDZ High, Delay >40ms then Unmute Amplifier.

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    Hi Derek,

    Thank you for your reply.

    For the TPA3116 circuit, I only refer to other mute circuit. so I don't know this mute how to work?

    Can you help me to analyze the working principle of this mute circuit? How do these parts(transistor and TL431) work?

    SIP2 is mute jumper, if this jumper connect to ground, the amplifier don't work. please see attached mute circuit.

    If I remove all components of mute circuit, only connect mute (Pin12) to ground. Is the function OK? I worried POP noise when start up power or power off

    Andy

  • 0 in reply to user6280325
    Prodigy 60 points

    Hi Derek,

    I also attached the amplifier circuit to you.

    Please help me to analyze the working principle of this mute circuit.7343.TPA3116 schematic.pdf

    Thank you

  • 0 in reply to user6280325
    TI__Mastermind 19320 points

    Hi Andy,

    I do not know how the TL431 and Q3 work. I only know when SIP2 connects to GND, the MUTE voltage is high.

    As talked before, only connect mute (Pin12) to ground has no function problem, but it has power-up pop risk.

    Regards,

    Derek