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  • UCC256404: UCC256404 operation at -55°C

    TI Thinks Resolved
    Part Number: UCC256404 Tool/software: Hi, The junction temperature of UCC2564040 is -40°C. Can this IC work up to -55°C or the parts can be screen out to operate at -55°C. Thanks Ankit

  • UCC256404: Ucc256404 not start with full load

    Part Number: UCC256404 Tool/software: I have problem to start modified eval board UCC25640EVM-20. New transformer is wound to secondaty winding to 80V. Primary to secondary turns ratio is 2,36, Primaty bias yurns ratio is 11. Calculation is attached…

  • UCC256404: Feedback loop oscillation

    TI Thinks Resolved
    Part Number: UCC256404 Tool/software: LLC Converter feedback loop not stable.docx Pls see the Document for system details and Problam statement. My CV Loop is fully stable but in CC Loop , whole system oscillates at 2.6Khz . Can someone suggest right…

  • UCC256404: Surge immunity Issue fro UCC256404 and UCC28019

    TI Thinks Resolved
    Part Number: UCC256404 Other Parts Discussed in Thread: UCC28019 , UCC24624 Tool/software: Dear Sir, I have new issue with surge immunity for my charger for EV new design the issue is when surge immunity test the POWER MOSFET for half bridge,POWER…

  • UCC256404: Burst soft off does not end

    Part Number: UCC256404 Tool/software: I've encountered an issue where the burst soft off doesn't end. Please refer to the attached diagram. ch1:Switching FET-Vgs, ch2:Switching FET-Vds, ch3:ISNS, ch4:FB The conditions are Vout=24V, Iout=1.4mA…
    • 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

  • UCC256404: Abnormal burst operation

    TI Thinks Resolved
    Part Number: UCC256404 Tool/software: Hi, Team Something different from normal is happening with the burst operation of UCC256404. After Burst ON, it may turn Burst ON without turning Burst OFF. (For details, please refer to the attached waveform.)…
    • Answered

  • UCC256404: Capacitor of BLK_PIN and BW_PIN

    Resolved
    Part Number: UCC256404 Tool/software: Hello. I have a question about UCC256404. In TI_EVM it is as follows: 1. The capacitor of C23 and C55 of BLK_PIN = 220pF + 2.2nF. 2. The capacitor of C30 of BW_PIN = 5.6pF. I would like to increase the…
    • Resolved
    • Answered

  • UCC256404: Startup issue of UCC256404

    Resolved
    Part Number: UCC256404 Other Parts Discussed in Thread: PMP40580 , TL431 Tool/software: The previous thread was locked, so I couldn't add to it, but I did realize my error with only trying to power the LLC. I didn't think I could startup the chip with…
    • Resolved

  • UCC256404: The output voltage exceeds the set voltage

    Part Number: UCC256404 Other Parts Discussed in Thread: UCC256301 Tool/software: Following your advice, I changed from UCC256301 to UCC256404, but the issue of the output voltage rising above the set voltage was not resolved. The same waveform is observed…

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