TPA3113D2 Calculation Procedure of PLIMIT

Sadanori Kato

Hi,

Could you please tell us the calculation procedure of "Table 2. PLIMIT Typical Operation" which is mentioned on page 16 of data sheet as below?
Although we calculated them simply, we could not obtain same results.

Best Regards,
Kato

over 9 years ago

0 user5276421 over 9 years ago

TI__Mastermind 37045 points

Hi Kato-san,

I will send you the calculation xls vie email.

reg,

Paul.

0 Sadanori Kato over 9 years ago in reply to user5276421

Guru 36490 points

Hi Paul-san,

Thank you for your quick reply.
I will confirm the xls file which you sent to me in detail.

Best Regards,
Kato

0 Shinichi Inoue over 9 years ago in reply to user5276421

Guru 19701 points

Dear Paul san

Could you send me the calculation xls, too.

Actually, my customer encountered the same problem.

Best regards,

Shinichi

0 Sadanori Kato over 9 years ago in reply to Shinichi Inoue

Guru 36490 points

Hi Shinichi-san,

Please see the following post.

http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/p/368208/1301335

Best Regards,
Kato

0 Shinichi Inoue over 9 years ago in reply to Sadanori Kato

Guru 19701 points

Dear Kato san

Thank you for your quick reply.

I can get the xls file.

I'll send the customer.

I appreciate your great help.

Best regards,

Shinichi

0 Shinichi Inoue over 9 years ago in reply to Shinichi Inoue

Guru 19701 points

Dear Kato san and Paul san

Thank you for your reply.

The customer was confirmed the xls file.

He said the result is not correspond between datasheet and xls.

Could you please teach the following questions.

Also could you see attached xls file.

Q1 Where is Rfet ? (I think Rfet is a Rdson of internal FET. Is it correct?)

Q2 Where is Rckt ? (I think Rckt is a Resintance of inductance and PCB. Is it correct?)

Q3 Why are two values of red frame different ?

Q4 P\ease teach me the conditions that values of exponential fit's table (green frame) are changed.

Q5 Are they related with PVCC value (PVCC=12V or 24V) ?

Best regards,

Shinichi

1222.TPA311xD2-Plimit-calcs(2).xlsx

0 Shinichi Inoue over 9 years ago in reply to Shinichi Inoue

Guru 19701 points

Dear Specialists

Does anyone reply?

My customer wants to know the difference the datasheet and excel file.

Could you please advise me following questions ?

Also could you see attached xls file.

Q1 Where is Rfet ? (I think Rfet is a Rdson of internal FET. Is it correct?)

Q2 Where is Rckt ? (I think Rckt is a Resintance of inductance and PCB. Is it correct?)

Q3 Why are two values of red frame different ?

Q4 P\ease teach me the conditions that values of exponential fit's table (green frame) are changed.

Q5 Are they related with PVCC value (PVCC=12V or 24V) ?

Best regards,

Shinichi

1121.1222.TPA311xD2-Plimit-calcs(2).xlsx

0 Sadanori Kato over 9 years ago in reply to Shinichi Inoue

Guru 36490 points

Hi Shinichi-san,

A1. Yes, it's correct.
A2. Yes, it's correct.

I recommend that you evaluate it in a laboratory and please inquire to TI local office FAE regarding the remaining questions.

Best Regards,
Kato

0 Shinichi Inoue over 9 years ago in reply to Sadanori Kato

Guru 19701 points

Dear Kato san

Thank you for your reply.

As your advise, I'll ask other questions to TI local FAE.

I appreciate your great help.

Best Regards,
Shinichi

0 user5276421 over 9 years ago in reply to Shinichi Inoue

TI__Mastermind 37045 points

Hi Shinichi-san,

Please refer to the attached doc -

TPA311x-PLimit-100810.doc

reg,

Paul.

0 Shinichi Inoue over 9 years ago in reply to user5276421

Guru 19701 points

Dear Paul

Thank you for your reply.

I'll confirm the document.

I appreciate your great help.

Best regards,

Shinichi

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TPA3113D2 Calculation Procedure of PLIMIT