Original question:
Part Number: UCC2897A
Other Parts Discussed in Thread: TPS2373, , TPS2372
Tool/software:
Dear TI,
I was asked to ask my question here. I'm having some problems implementing the active clamp forward design with the PoE chip TPS2373 and the UCC2897A. I believe that the UCC is in a hiccup mode. Can you please help me solve this issue.
Schematic:
Hi Hong Huang,
Sorry for the confusion. I used the TPS2373 as a reference design. The output voltage of this system should be 5V. Its now 1,3V. I noticed earlier with a thermal camera that D5 was getting very hot. I also could here an audible switching sound. I couldn't find the issue so i contacted the TPS2372 team.
I measured the gate voltages of the FET's and it looks to be normal.
Then I measured VCin and VCout.
Green is VCIN; Blue is VCOUT; Yellow is VDD.
Could you please help me figure out how to fix this issue.
Kind Regards,
Mike Oudshoorn
