Would you advise me the follow issue?
My customer is during evaluation of PFC with UCC28070.
They power supply spec is
Input voltage:universal power supply
Output:380Vdc 2500W
reference design
1200W PR779-PR778
3000W:PMP4259
5000W:PMP4311A
Issue
- Load-Output Characteristics will not get better
The more getting load, the more lower output voltage.
(About drop 50V, no-load,input 100V,output 200Vdc 1.3-2.6A)
We order to confirm the follows.
- The waveform of current flow the diode after inductor
- The difference voltage between GND of output condenser and UCC28070's GND
- Is it stable about the voltage of Vsense in UCC28070?
I will send you the data,If you are possible.
Best regard
Hayashi
