TIDA-00173: TIDA-00173 related questions.

Toshihiro Sakakima

Prodigy 130 points

Part Number: TIDA-00173
Other Parts Discussed in Thread: UCC28711, LMS33460

Tool/software:

Hello, Jerome.

Thank you for answering questions from Ryu.

I am customer enginner of Ryu.

In fact, I asked more questions to Ryu and some of questions Ryu have answered to me.

However, He advised me I ask some of questions directly in E2E because more better answer is expected from TI engineers more quickly.

Then, I would like to ask one question at first.

I can't understand how can we derive from below(Equation 14 in TIDA-00173).

I have looked up the basic R and L relationship equations and formulas, but it remains unclear how this equation was derived.

Sorry, could you please tell me how this equation was derived. That would great help to understand 5.2.6 Current Sensing.

*Like above, I have 10 ~ 15 quesitons regarading TIDA-00173.

However, uploading each question separately to E2E is a lot of work for me.

Likewise, I imagine it is difficult for TI engineers to answer each question individually.

Then, can I create a list of about 10 to 15 questions in Excel and upload it to the E2E system? Can I then get the list of TI engineer's answers there?

I appreciate your reply in advance.

3 months ago

0 Jerome Shan 2 months ago

TI__Intellectual 1600 points

Hello Toshihiro,

This equation 14 of TIDA-00173 comes from the equation 27 in the datasheet of UCC28711 in page 21:

UCC2871x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. C)

I will reach to you offline on the rest questions.

Best regards,

Jerome Shan

0 Toshihiro Sakakima 2 months ago in reply to Jerome Shan

Prodigy 130 points

Hello, Jerome-san,

I have read the TIDA-00173 document up to 5.2.7, as well as the related UCC2871X datasheet, and have attached an Excel summary of the unclear points that I did not understand.I would appreciate your response.

This reply is not the end of all questions. I would like to resolve my questions by reading TIDA-00173 5.2.8 or later, UCC2871X, and the LMS33460 datasheet.

Therefore, I will have more questions later.I am reading TIDA-00173 5.2.8 or later now, but I still have some questions.I will present them in order after tomorrow.

We do not currently know how many questions there will be in all, but generally, if you can read all five chapters of TIDA-00173, you will know how many there will be in all.We will contact you with an estimate of the work at that time.To_Texas Instruments_E2E _QandA_TIDA-00173_chapter5_and_schematics_and_UC28711_LMS33460.xlsx

0 Toshihiro Sakakima 2 months ago in reply to Toshihiro Sakakima

Prodigy 130 points

Hello, Jerome-san

Thank you for quick action.

I appreciate it.

(The following comments are in response to Jerome's direct e-mail to me.)

I await contact from power power design expert.

Best regards,

Toshihiro Sakakima

0 Toshihiro Sakakima 2 months ago in reply to Jerome Shan

Prodigy 130 points

Hello Jerome-san,

I apologize for the late reply on this matter.

I checked the (27) formula on page 21 of the UCC28711 datasheet.

However, I don't understand why (KLC(coefficient) * RS1(resistance) * RCS(resistance) * td(time) * Npa(turns ratio = coefficient)) / Lp(inductance) equals RLC(resistance).

This may be a basic formula. However, I would be very grateful if you could answer my question.

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TIDA-00173: TIDA-00173 related questions.