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UCC28070: UCC28070 maximum duty setting

Masazumi Ishii

Genius 3945 points

Part Number: UCC28070

Hello.

UCC28070 maximum duty setting

e2e.ti.com/.../3095348

I have additional questions.

In the case of UCC28070 maximum duty setting, the operation was confirmed by changing the sync pulse width to 250nS, 500nS, 1000nS, 1500nS. (Oscillation frequency is 100kHz for single phase and 200kHz for sync pulse)
Please see the attached document for the results and details.

Also,
e2e.ti.com/.../3095348

What is the answer to the last question?

Thank you.

3365.UCC28070-1.pdf

over 6 years ago

0 Teng Feng over 6 years ago

TI__Genius 13660 points

Hi Masazumi, an expert will get back to you soon. ——Teng

0 Bliss Zhou over 6 years ago

TI__Expert 3470 points

Dear Masazumi,

I am so please hear form you. for you question, could you please confirm below items?

1, Did you disable frequency dithering (pulling CDR > 5 V)?

2,To ensure the internal oscillator does not interfere with the SYNC function, RRT must be sized to set the internal

oscillator frequency at least 10% below fSYNC.

in addition, The min pulse width is recommended.

thanks

0 Masazumi Ishii over 6 years ago in reply to Bliss Zhou

Genius 3945 points

Hello

thank you for your answer.

Well, I checked, but CDR> 5 V (Vref connection), I can not find the problem in particular.

An excerpt of the UCC28070 part can be sent.
If necessary, please provide your email address.

Thank you.

0 Bliss Zhou over 6 years ago in reply to Masazumi Ishii

TI__Expert 3470 points

Hi,

Did you set the internal oscillator frequency at least 10% below fSYNC.

I recommend you set the pulse width 200ns in your design.

I share my email bliss-Zhou@ti.com on here if you have more questions.

thanks