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  • UCC256404: UCC256404

    Part Number: UCC256404 Tool/software: Hello TI Team, I am using UCC256404 llc resonant controller for my AC to DC converter with out PFC.My input voltage range is 103VAC to 127VAC,50W converter .I am facing startup issues with full load,I kept the OCP…

  • UCC256404: UCC256404 HB -LLC always in burst mode

    Part Number: UCC256404 Other Parts Discussed in Thread: UCC25640EVM-020 Tool/software: Hi We have implemented a power supply of 100W PFC +LLC using UCC2818EP and UCC256404. When we tested our PCB it is giving us less efficiency than the test results performed…

  • UCC256404: UCC256404: I have a problem with the boot of the UCC256404

    Part Number: UCC256404 Tool/software: According to the UCC256404's technical specifications, pin 1 is the HV input, and after feeding the PFC out line to this input with its resistors, a 13V LDO output should appear on RVCC pin 12. In my case, there…

  • RE: UCC256404: UCC256404

    I think your loop response is not optimized. Please use type II or type III filter to speed up the response. It will help reduce the overshoot. For your 1st question, please monitor Vout as well. I suspect OVP is triggered as FB drops significantly after…

  • UCC256404: UCC256404: startup problem if using high value secondary side capacitor - follow up

    Part Number: UCC256404 Tool/software: Hi Manikanta and Team, what was the outcome of the above question? We have a similar problem with start up behaviour of UCC256404. BR, Leo

  • RE: UCC256404: UCC256404 no output regulation in startup

    Hello, Your FB pin and bulk pin seem to have a lot of high frequency noise on them. These pins should not be that noise. Maybe you have noise coupling into these pins. You might want to retake these waveforms with the scope probe ground close to the…

  • UCC256404: Occasional problem with startup without load.

    TI Thinks Resolved
    Part Number: UCC256404 Other Parts Discussed in Thread: UCC28064 Tool/software: Hello. After months I create 1200W power with UCC256404 using. Output is 80V 15A. It works well, but sometimes have problem with starting without load. Typically problem…
    • Answered

  • UCC256404: Still problem with starting with higher calculated load.

    Resolved
    Part Number: UCC256404 Other Parts Discussed in Thread: UCC28064 Tool/software: Hello. I have question about startup of UCC256404. My design works well but I have problem with starting with full load. Output of trafo is designed for 80V and 10A (800W…
    • Resolved

  • UCC256404: AC high line operate in ambient 90 degreeC IC RVCC unstable

    TI Thinks Resolved
    Part Number: UCC256404 Tool/software: Hi Expert , As topic, my customer test this part find in that condition RVCC became unstable then their system can not open. but the IC in AC low line the RVCC is really good and system was safe. please refer to…
    • Answered

  • UCC256404: Input current oscillations when controller changed to UCC256404 (add controller heating)

    Resolved
    Part Number: UCC256404 Other Parts Discussed in Thread: PMP21683 , , UCC256302 , UCC256402 Tool/software: We are updating the controller (UCC 25630x to UCC256404) on a TI LLC reference design (PMP21683) and are following the TI migration paper (SLUA 996A…
    • Resolved

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