TPA3118D2 - Plimit and power down control without Mute pin

Hirotaka Matsumoto

Other Parts Discussed in Thread: TPA3118D2, TPA3118D2EVM

Hi all,

Would you mind if we ask TPA3118D2?

<Question1>
Is it possible to control power down without Mute pin?
(We'd like to know whether it is possible to power down using only SDZ pin.)
We quess that there is not to control shutdown down pin(SDZ).

And then, SDZ pin or Mute pin were truned on, Fault pin will be low(operation)?

<Question2>
On the datasheet, there is "Add a 1 µF capacitor from pin PLIMIT to ground to ensure stability."
If the value of capacitance increases(as like from 1uF to 10uF), will the voltage be improved?
We'd like to use PLIMIT function to improve in case of voltage drop.

We need your help.

kind regards,

Hirotaka Matsumoto

over 10 years ago

0 Don Dapkus over 10 years ago

TI__Guru**** 189401 points

Hi, Matsumoto-san,

1. This is fine. SDZ and Mute are almost the same.

2. Adding additional decoupling will not change the functionality. I don't understand what you are trying to accomplish by doing this. Can you explain the goal?

-d2

0 Hirotaka Matsumoto over 10 years ago in reply to Don Dapkus

Guru 27585 points

Don san,

Thank you for your reply.
And we apologize that my explanation made you confuse.

1. OK. We'd like to confirm about Faultz pin and SDZ pin on the TPA3011D2EVM.
     JP3 means that  if automatic recovery from the short circuit protection latch is desired,
   connect the FAULTZ pin directly to the SDZ pin.
     Is our recognition correct?
     And then why is the MUTE controled using FAULTZ pin?
     Is it required to control both pin(FAULTZ and SDZ)?

2. As our request, according to the setting of capacitanse of Plimit(increasing),
     when the voltage supply is down(transient), it will be the method of transient?
     We guess that recommended the value of capacitance is 1uF as it shows on the datasheet P2.

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 10 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Don san,

I changed the content of questions.
That's why, could you let know us above?

Kind regards,

Hirotaka Matsumoto

0 Hirotaka Matsumoto over 10 years ago in reply to Hirotaka Matsumoto

Guru 27585 points

Don san,

Thank you for your E-mail.

We apologize that our question makes you confuse.
We'd like to know followings;

<Q1>
We'd like to confirm about Faultz pin, SDZ pin and MUTE pin on the TPA3011D2EVM.
JP3 means that if automatic recovery from the short circuit protection latch is desired,
connect the FAULTZ pin directly to the SDZ pin.
And about MUTE, pull the MUTE pin low with the FAULTZ signal with a inverting transistor to ensure a high-
Z restart, like shown in the figure below:
Is our recognition correct?

<Q2>
What is the capacitanse of PLIMIT used for?(for stabitilty?)

Kind regards,

Hirotaka Matsumoto

0 Mohamed Hellal over 10 years ago in reply to Hirotaka Matsumoto

TI__Intellectual 2295 points

Hirotaka san,

<Q1> Do you mean the TPA3118D2EVM ?

The FAULTZ pin reports to some general fault like Over-temp, DC Detect, Open drain..

(High level for normal operation, and Low for fault condition) if you short the JP3 whenever there is any fault, it will shutdown the amplifier (and mute) .

JP3 shorted-> if fault condition: FAULTZ low -> SD low => amplifier shutdown

If you don't short the JP3, it will only mute the part if there is fault condition..

<Q2> The capacitance at PLIMIT pin is simply a bypass capacitor

Regards,

Mohamed Hellal

0 Hirotaka Matsumoto over 10 years ago in reply to Mohamed Hellal

Guru 27585 points

Mohamed san

Thank you for your prompt reply!
We got it!

Kind regards,

Hirotaka Matsumoto

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TPA3118D2 - Plimit and power down control without Mute pin