UCC28070: Voltage Dip and Interruption test damaged UUT

Hello

Can you please post the schematic for this pfc ?

Regards

John

Dear John

Thank you for your reply 

The schematic is most likely the same configuration as TI UCC28070 reference. And the controller setting is according to

UCC28070 Excel Applications Design Tool (Rev. A)

We have tried to trimming the voltage loop/current loop/PKlMT.  But it still can't solved this issue. 

Is it related to Vinac peak and kVFF factors of the controller?

During 70vac, the pin of VINAC (pin5) is around 0.7V. 

Hi Keigo,

The Excel document you attached was for a 500W pfc with an 85Vac min input.
Your design is for a 2.4kW application which operates at least to 70Vac.

Also which TI reference design do you refer to ?

With VINAC = 0.7V the multiplier output is zero and the PWM is disabled.

Regards

John

Dear John

Would  you provide me your email box address?

I can send you the controller schematic.

That excel is as a design template reference.

Of course, I have changed the parameters

Regards

Keigo

Hi Keigo,

You can send me any relevant information to johngrifftin@ti.com