UCC25661: Regarding the PFC on/off control function during burst mode in the UCC256614.

Part Number: UCC25661

Tool/software:

Hi team,

My customer is evaluating the UCC256614 and testing sample devices.

Among the UCC25661x series, the UCC256614 appears to be the device that can control the on/off state of the PFC during burst mode.

In their evaluation, they found that while the PFC can be turned off when entering burst mode, it does not fully turn back on when exiting burst mode.

Additionally, the voltage at the TSET pin fluctuates.

Since they are considering this device to improve efficiency under light load conditions, this function is essential. What could be the possible causes of this issue?

Best regards,

Kyoehi