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  • UCC28782: Startup delay issue

    Part Number: UCC28782 Tool/software: Hello, My Name Kumar, We have designed a flyback 40W power supply Vin:105Vac to 132Vac, Vout:20.8Vdc@ 2Amp load. I have seen a start up delay issue in my design as below. till 13V it was increasing linearly, after…

  • RE: UCC28782: About RDM settings

    Hi Kaji-San, I spoke with the experts and following is the summary of their feedback: 1. An improper RDM along with EMI dithering basically can cause low side MOSFET turn on at higher Vds – so higher power losses can be resulted – which can also have…
    • Answered

  • UCC28782: DBUR selection

    Resolved
    Part Number: UCC28782 Tool/software: Hello, Experts, Customer would like to know how to select DBUR. Would you tell how to select it, please? SS115LW RVG can be used?(It is used on EVM, called D3 and D17.) Best Regards, Fujiwara
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    • Answered

  • RE: UCC28782: Increasing RDM resistance causes device to not start

    Resolved
    Hi Kaji-San, Sure, we will keep you posted on this, but I will need to close this thread for now. Please feel free to reopen this in a week's time, I will try to have more information on this. Regards, Harish
    • Answered

  • UCC28782: RRDM setting range

    Resolved
    Part Number: UCC28782 Tool/software: Hello, I am considering a UCC28782 device. I would like to ask you about the RRDM setting range. I am adjusting PWMH by changing the RRDM constant, but I am experiencing the following situation. When RRDM is over 200kΩ…
    • Resolved
    • Answered

  • UCC28782: Burst mode operation

    Resolved
    Part Number: UCC28782 Tool/software: Hello, I would like to ask you a question regarding the burst mode operation of the UCC28782. (Question 1) When transitioning from LPM to ABM, excessive voltage is applied to the SR_FET Vds. Please see the enlarged waveform…
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    • Answered

  • UCC28782: Behavior when Vsw drops

    Resolved
    Part Number: UCC28782 Tool/software: Hello, I would like to ask you about the behavior of UCC28782 when Vsw drops. The attached figure shows the waveform when Vsw (Vds) drops. When the low-side turns on, Vsw rises again. The part circled in red. I would…
    • Resolved
    • Answered

  • UCC28782: About constants input into calculation tools

    Resolved
    Part Number: UCC28782 Other Parts Discussed in Thread: UCC5350 , UCC27712 , LMG3622 , LMG3616 , PMP23224 Hello, I am checking the constants input into the UCC28782 calculation tool. In order to use UCC5350SB as a gate driver, I am considering the constants…
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    • Answered

  • UCC28782: Regarding selection of secondary side synchronous rectification controller

    Resolved
    Part Number: UCC28782 Other Parts Discussed in Thread: UCC24612 , UCC28780 , LMG3616 , LMG3622 Hello, I asked a question in the thread below about the secondary side synchronous rectification controller used with UCC28782 and got an answer. I would like to…
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    • Answered

  • RE: UCC28782: Questions about constants in calculation tools

    Resolved
    Thank you for your reply. I contacted the person in charge of GaN and was able to get an answer in the thread below. Best regards, e2e.ti.com/.../lmg3616-about-coss-vs-voltage-curve

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