TEA2017 - PFC Switching Frequency and Ringo Settings

[NonoSerranoVP]

Hi everyone, 

I'm using a TEA2017 controller in a PFC + LLC converter, and I'm having some issues with the controller's settings in the Ringo SW. Since I don't know if I can share screenshots, I'll just summarize the issue: 

1. When certain max/min switching frequencies are selected (i.e. 25kHz - 100kHz), regardless the remaining settings in the "PFC/Operation/Frequency" fields, the maximum switching frequency is never reached along the line period, even at high power. Regardless the min/max switching frequencies selected, it only varies from 40-80kHz along the line period. 

2. Then, I tried disabling the valley switching operation, and the PFC switching frequency actually follows the set values. 

Why is this happening? How is valley switching influencing the operation in CCM? Could anyone give me an application note or any hints that help me understand how to properly set the TEA2017 parameters to achieve valley switching in DCM/BCM and the frequency modulation I want in CCM at high load? 

Thank you for your time and I'm looking forward to your reply. 

Best regards,

Nono

[RafaR · Accepted solution]

Hello NonoSerranoVP

Good Day!

Have you already checked out our User Manuals? We have two that might be useful to you: UM11725 and UM11657

You can find these documents on our official website TEA2017.

With your current description, I can't fully identify your issue, so if you still have questions, I recommend opening a ticket with us. That way, we can talk confidentially and you won't have to worry about sharing information or pictures. We can further follow up on your issue.

I hope this information has helped you, please let me know if you need help with anything else.

Have a great day and best of luck.