TPS7A4101: Bode plot data

Kenji Ohno1

Genius 5095 points

Part Number: TPS7A4101
Other Parts Discussed in Thread: TINA-TI

Hi Team,

I request the following data from customers.

· Bode plot of plant

· Bode diagram of FB line

Can these be obtained from WEBENCH?

Please tell me how to obtain it

Best Regards,

Kenji

over 6 years ago

0 kai klaas69 over 6 years ago

Guru 140200 points

Hi Kenji,

the data can be obtained by measurement:

www.ti.com/lit/an/snva364a/snva364a.pdf

Kai

0 Mark Sellers over 6 years ago in reply to kai klaas69

TI__Expert 6835 points

Hi Kenji,

The best way to obtain this data would be on the bench using an injection transformer in the FB loop. One common mistake that is made is only breaking the loop for the FB resistors and not the feed forward capacitor as well. If you do try this on the bench make sure that the feed forward cap is being removed from the loop as well.

Regards,
Mark

0 Kenji Ohno1 over 6 years ago in reply to Mark Sellers

Genius 5095 points

TPS7A4101 Loop Sim.TSCHi Kai-san,Mark-san,

Thank you for your response.

I checked the data with TINA-TI. However, even if Cbyp was attached and removed, the loop characteristics did not change.

Why does not the property change?

Why do you know the reason?

Best Regards,

Kenji

0 kai klaas69 over 6 years ago in reply to Kenji Ohno1

Guru 140200 points

Hi Kenji,

I think you must connect the voltage pin "VFB" to the - terminal of "VG1". Or by other words, both voltage pins must be connected directly to the terminals of "VG1": "VOut" to the + terminal of "VG1" and "VFB" to the - terminal of "VG1".

Kai

0 Kenji Ohno1 over 6 years ago in reply to kai klaas69

Genius 5095 points

Hi Kai-san,

Thank you for answering.
But, I couldn’t simulate well.
I would like the simulation data of the condition below.Can you do it?

Cbyp＝1nF/10nF/100nF/470nF

Best Regards,
Kenji

0 Kenji Ohno1 over 6 years ago in reply to Kenji Ohno1

Genius 5095 points

Hi Kai-san,

I am waiting for a great answer from you.

I appreciate your special support.
Best Regards,
Kenji

0 kai klaas69 over 6 years ago in reply to Kenji Ohno1

Guru 140200 points

Hi Kenji,

sorry for letting you wait. Mark Sellers should answer your question. I'm not an employee of TI...

Kai

0 Kenji Ohno1 over 6 years ago in reply to kai klaas69

Genius 5095 points

Mark-san,

Can you make my wish come true?

Best Regards,
Kenji

0 kai klaas69 over 6 years ago in reply to Kenji Ohno1

Guru 140200 points

Hi Kenji,

I tried to make the simulations for you in the meantime, but I didn't get useful results either...

Kai

0 Kenji Ohno1 over 6 years ago in reply to Kenji Ohno1

Genius 5095 points

Dear Mark-san,

I am waiting for your answer.
If you do not deal with my request, please tell me a little more.

Best Regards,
Kenji

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TPS7A4101: Bode plot data