UCC25661: UCC28064A+UCC256614 PFC ON/OFF

Chen Bo Xuan

Prodigy 10 points

Part Number: UCC25661
Other Parts Discussed in Thread: UCC28064A

Tool/software:

How can I use the UCC256614 PFC ON/OFF function to control the UCC28064A?
Can you provide a reference design?

2 months ago

0 JCHK 2 months ago

TI__Guru 50190 points

Hi Bo Xuan,

Here is how to use the TSET pin from the UCC256614 to disable the PFC when it enters into burst mode:

I hope this answers your question.

0 Chen Bo Xuan 2 months ago in reply to JCHK

Prodigy 10 points

Hi Jchk,

After using your reference design.
How can I control the startup time of UCC28064A?

C1:PFC Gate.

C2:PFC output voltage.

0 JCHK 2 months ago in reply to Chen Bo Xuan

TI__Guru 50190 points

Hi Bo Xuan,

This is the devices soft-start which will depend on how the COMP pin is setup. I recommend starting another thread for how to optimize the soft-start time of the UCC28064A.

Power management

Power management forum

UCC25661: UCC28064A+UCC256614 PFC ON/OFF