TPS65266-EVM / crossover frequency chart

ACGUY

Guru 11170 points

Hi all,
We are in need of crossover frequency chart of TPS65266-EVM.
Please provide for us.

Thanks and regards,
Nagai

over 9 years ago

0 Jason Wang (BSR-MV) over 9 years ago

TI__Genius 9550 points

Nagai,

test status, Vin 5V, full loading

buck1: crossover frequency 59.5 degree

buck2: crossover frequency 75 degree

buck3: crossover frequency 61 degree

Jason Wang

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

Hi Jason,

Thank you four your reply.
Our customer has a plan to operate the device in 1MHz.
Could you let us know the measurement condition?

Regards,
Nagai

0 Jason Wang (BSR-MV) over 9 years ago in reply to ACGUY

TI__Genius 9550 points

Nagal,

yes, the result is under FSW 1MHZ from our offcial EVM board.

Jason Wang

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

Hi Jason,

Thank you so much!
If possible, I do like to get a Bode-plot.
Could you provide to me it?

Best regards,
Nagai

0 Jason Wang (BSR-MV) over 9 years ago in reply to ACGUY

TI__Genius 9550 points

BUCK1: Vin 5v VOUT1V IOUT 3A

BUCK2: Vin 5v VOUT1.5V IOUT 2A

BUCK3: Vin 5v VOUT1.8V IOUT 2A

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

Hello Jason,

Thank you for your cooperation.
By the way, I have a question.
In previous post, crossover-frequencies were follows:
>> buck1: crossover frequency 59.5 degree
>> buck2: crossover frequency 75 degree
>> buck3: crossover frequency 61 degree
Did you change the conditions?

Best regards,
Nagai

0 Jason Wang (BSR-MV) over 9 years ago in reply to ACGUY

TI__Genius 9550 points

please ignore the previous data and only find result in bode plot.

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

OK! Thank you for your cooperation!

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

Hello Jason,
May we ask to you again?
I sent the crossover-chart to our customer.
Then, they required a way to move up the phase margin.
Target is 45° or higher.
Can us make the phase margin more than 45° on the EVM?
please let us know the way.

Best regards,
Nagai

0 Jason Wang (BSR-MV) over 9 years ago in reply to ACGUY

TI__Genius 9550 points

Nagai,
Evaluate EVM and share the test result tomorrow.

0 Jason Wang (BSR-MV) over 9 years ago in reply to ACGUY

TI__Genius 9550 points

Nagai,

The changings are based on EVM schematic.

http://www.ti.com/lit/ug/slvuad7a/slvuad7a.pdf

buck1:

C6 change to 3.3nF, R3 change to 6.6Kohm

buck2:

C16 change to 4.7nF, R10 change to 11Kohm

buck3:

C20 change to 4.7nF, R15 change to 11Kohm

Jason

0 ACGUY over 9 years ago in reply to Jason Wang (BSR-MV)

Guru 11170 points

Thank you very much!!

0 Dan Dunga11 over 9 years ago in reply to Jason Wang (BSR-MV)

Prodigy 20 points

Hi Jason,

Sorry for hijacking this thread but I need to calculate the crossover frequencies for this convertor as well only I've changed the design slightly.
What did you use to get the Bode plots and is it something you can share?

Best regards,
Dan

0 Jason Wang (BSR-MV) over 9 years ago in reply to Dan Dunga11

TI__Genius 9550 points

Dan, I will send the spreadsheet via email.

Let me know your email address.

jason.wang@ti.com

0 Dan Dunga11 over 9 years ago in reply to Jason Wang (BSR-MV)

Prodigy 20 points

Hello Jason,

Thank you very much!

My email is: dan.dunga@movidius.com

Have a nice day,

Dan Dunga

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TPS65266-EVM / crossover frequency chart