TPA3116D2 - About usage

Hi, Kanemaru-san,

Unfortunately, you don't have enough voltage. In order to get 50W into 4-ohms, you need 21V.

See the EVM for the recommended heat sink design.

-d2

Hi, Don-san,

Thank you for your prompt reply.

I checked a heat sink of EVM, but there was not information of the thermal resistance.

Do you have information about thermal resistance?

<Heat sink of EVM>

Part No.  : “ATS-TI 10 OP-521-C1-R1”

Maker HP :   www.qats.com.

Hi, Kanemaru-san,

I don't have that data at my fingertips. Let me see if I can find it for you.

-d2

1212.Thermal Characterization Report for ATS-TI10P-521-C1-R1.pdf

Hello Hideto-san,

Attached is the heat sink characterization report.

reg,

Paul Chem

Audio Applications Engineer

Dallas TX

Hi, Don-san, Paul C-san

Thank you for the information.

Please let me ask one more question.

I got an answer from Don.

Why is the voltage lack at 15.2V?

<Answer for [Q1] (by Don-san)>

Unfortunately, you don't have enough voltage. In order to get 50W into 4-ohms, you need 21V.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Q1]

Is TPA3116D2 available in the following condition?

[Condition]

・PVcc=15.2V

・RL=4Ω

・Pout=52W

・Output Wave = Square wave

   (THD+N = unlimited)

* The output may clip it.

 If TPA3116D2 does not breaking, I am reliable.

Hi Hideto,

Please refer to datahseet for Max Output Power vs Supply Voltage. If you are using it in 1xPBTL mode for Po=52W, the supply needs to be at least 15V. However, If you are using it in 2xBTL mode with Po=2x50W then the supply need to be at least 21V.

reg,

Paul.

Hi, Aaul-san

Thank you for your prompt reply.

I understood that the high voltage(PVcc) was necessary to get the high output Power(Pout).

Does Pout=50W(@PVcc=15.2V) point at output Power of PMAX of attached file P12 Figure5?

Why will the high voltage(PVcc=21V) be necessary?

For example, does high RON resistance of the MOSFET of TPA3116D2 become the factor?

Hi, Kanemaru-san,

I'm not sure what you're asking. Figure 14 clearly states operation in BTL into 4-ohm loads.

For PBTL, we usually halve the speaker resistance in order to achieve more power. For example, Figure 22 shows power and voltage for a 2-ohm PBTL-connected load.

I suggest you order an EVM and play with it, or talk to the TI guys in your local office for more information.

-d2

Hi,Don

Sorry for troubling you.

I understand that PVcc=21 is necessary to satisfy "Pout=50W @ THD+N=10%".

(datasheet P6 Po (Continuous output power))

However, the specifications that my customer needs are as follows.

<my customer’s specifications >

・PVcc=15.2V

・RL=4Ω

・Pout(max) = 52W @ THD+N = “Over 10%(allows an output wave are square wave)”

< back ground >

My customer does not use the Pout(max).

(my customer doesn't drive a speaker in Pout(max).)

However, it is necessary as catalogue specifications of the customer application.

Therefore, it is important TPA3116D2 can satisfy specifications.

<My guess>

I understand that I raise PVcc to make Pout(max) big.

However,I think that necessary PVcc lowers than 21V(15.2V to 21V of range).

The reason is because a specification of THD+N is relaxed.

Will my understanding be wrong?

I am sorry for my questions being difficult to understand…

Regards,

Kanemaru

Hi Kanemaru,

I have tested a TPA3116 under your requested conditions, 15.2V supply for a 4-ohm load and measured the power delivered at THD = 20%, 10%, and 7% for BTL and PBTL modes. Please let me know if this is the data you were looking for. Thanks!

Regards,

Brian Wang

Values have been updated (above)

Hi,

Sorry for troubling you.

Ｉ understood. thank you very much.

Regards,

Kanemaru

Hi,

I'm very sorry.

Would you perform the following evaluations?

The value of THD+N does not matter.

<Condition>

・PVcc=15.2V , 21V , 24V

・RL=4Ω

・BTL

・input Wave = Square wave

・Output Wave = Square wave

<result>

・Pout(max)=??W @ PVcc=15.2V , RL=4Ω , Output wave = Square wave

・Pout(max)=??W @ PVcc=21V , RL=4Ω , Output wave = Square wave

・Pout(max)=??W @ PVcc=24V , RL=4Ω , Output wave = Square wave

Regards,

Kanemaru

Hi Kanemaru,

I will get back to you once I collect the data.

Regards,

Brian Wang

Hi Kanemaru,

I have taken this measurement to show you the Pout max (instantaneous) of the TPA3116D2 for the conditions:

- 4 Ohm load

- BTL mode

- 26 dB gain

- supply voltage: 15.2V, 21V, 24V

from the graph we can see:

・Pout(max)=41W @ PVcc=15.2V , RL=4Ω , Output wave = Square wave

・Pout(max)=73W @ PVcc=21V , RL=4Ω , Output wave = Square wave

・Pout(max)=91W @ PVcc=24V , RL=4Ω , Output wave = Square wave

 Please note this is instantaneous power, not continuous.

Regards,

Brian Wang

Hi, Brian

Thank you for your prompt reply.

Thank you for the measurement.

If it is PVcc=26V, I expect that it becomes “Pout(max)=over 100W”.

Sorry for asking too much.

Would it be possible to ask you to do following measurement ?

<Result>

・Pout(max)=??W @ PVcc=26V , RL=4Ω , Output wave = Square wave

Regards,

Kanemaru

Hi Kanemaru,

Let's use the original post. This is the result, Pout max around 103W.

Regards,

Brian Wang

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Hi, Brian

Thank you for your prompt reply.

Thank you for the measurement.

If it is PVcc=26V, I expect that it becomes “Pout(max)=over 100W”.

Sorry for asking too much.

Would it be possible to ask you to do following measurement ?

<Result>

・Pout(max)=??W @ PVcc=26V , RL=4Ω , Output wave = Square wave

Regards,

Kanemaru

Hi,Brian

I received an additional question from my customer.

Please tell me "the input condition" & “the Gain condition” when you measured "Pout(max)=103W".

ex . Input = ??(Sin or Square)wave , ?kHz , Vpp=??V

ex . Gain = ??dB

Regards,

Kanemaru

Hi Kanemaru,

The conditions for Pout(max) = 103W (instantaneous) conditions are:

input =  sin wave, 1kHz, 2.1 Vrms (5.94 Vpp)

gain = 26 dB

Regards,

Brian Wang

Hi, Brian

When you measured "Pout(max)=103W x 2ch @ PVcc=26V, RL=4ohm", did you output it for several seconds?

my customer wants to know that TPA3116D2 can maintain Pout(max) for several second.

Regards,

Kanemaru

Hi Kanemaru,

No, this is only instantaneous power, which is split second time. I have also measured the continuous Pout (max) which is the steady constant power before the device enters thermal shutdown. For the 4Ohm load, BTL, PVcc = 26V, the Pout max continuous is 53W.

Regards,

Brian Wang