Tool/software:
Dear TI Team,
I am working on the reference design PMP11282 Rev A, which is built on the PMP11064 Rev B PCB board. Currently, I am facing an issue where the PFC IC (UCC28063D) is not functioning, and I am unable to obtain the expected PFC output voltage.
For testing, I am applying an input voltage of 80–90 VAC, 50 Hz.
Please find below the measured voltages for your reference:
UCC28063D (PFC):
|
S.No |
Pin Details |
Measured Voltage (V) |
|
1 |
VSENSE |
1.901 |
|
2 |
HVSEN |
0.86 |
|
3 |
VINAC |
1.793 |
|
4 |
VREF |
6 |
|
5 |
CS |
0 |
|
6 |
COMP |
0.13 |
|
7 |
ZCDA |
0.239 |
|
8 |
ZCDB |
0.239 |
|
9 |
PWMCNTL |
14.39 |
For your reference, I have also attached the schematic PDF I am following.
8424.400 Watt Half Bridge LLC.pdf
Could you please help me identify why the PFC is not operating as expected? Any guidance or troubleshooting suggestions will be highly appreciated.
Best regards,
Anand