Part Number: UCC28711
Tool/software:
Hello TI Team,
I am facing multiple issues with my UCC28711DR-based flyback design(50W) and would appreciate your guidance. Schematic: Layout:
Background
Design Specs: Input is 40V-800V DC, 50W Power.
…
Guifre,
I would suggest maybe reviewing this video about debug of UCC287xx designs:
training.ti.com/getting-started-ucc287xx-family
There is also this debug document that would be useful:
e2e.ti.com/.../Trouble-shooting-startup-for-TI-PSR-controllers…
Other Parts Discussed in Thread: UCC28722 Having startup issues with UCC2877 flyback
Perhaps this question is best directed at the authors of the application not for the circuit tidu789c 230-V, 400-W, 92% High Efficiency Battery Charger With PFC and…
Hi Duke，
As there are many reasons could cause your phenomenon.
Would you check item by item according to below guide document?
startissues troubleshooting.pdf
Part Number: UCC28740 Tool/software:
Dear Experts,
At present, we are designing a flyback power supply using UCC28740. The design requirement is to input 300VDC can start, but during actual testing, we found that it cannot start at this voltage. The…
Hello Keshab,
Evidently, there are more issues than just the diode ones that I mentioned.
Please refer to this debug guide to help you get further along with the debug:
Troubleshooting TI PSR Controllers slua783.pdf
Perhaps something in this procedure…
Hello,
Not sure why connecting the HV9961 to the output or your flyback would cause regulation issues. You might want to study VDD, Aux and CS to see if you are turning off do to a fault.
The attached application note explains how the fault sensing…
Hello,
Your waveform looks like your design is operating deep into DCM and may be running at lighter loads. If you are operating at 55 kHz at this load to get the design to work at higher frequency you may just need to increase the load.
The waveform…
I had found the document you linked but it did not give much detail for current sharing. The question that I had referenced had indicated there was a power point document.
I found the attached document through a web search but didn't know if it was…
