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  • UCC28911: Asking for maximum power of UCC28911 under special condition

    TI Thinks Resolved
    Part Number: UCC28911 Hi team, UCC28911's datasheet mentioned that the maximum power UCC28911 can support is 12w, shown as below. And my customer wants to know the maximum power of UCC28911 under 90℃ and no wind condition. Could you pls help to answer…

  • UCC28911: Output voltage

    TI Thinks Resolved
    Part Number: UCC28911 Hi All, I have a question about the output voltage of UCC28911. I want to input 280V DC and output 54V DC, but according to WEBENCH, the maximum VOUT is 25V. Is it possible to output 54V with UCC28911? Best Regards, Ishiwata
    • Answered

  • UCC28911: Flyback converter works only if GND of UCC28911 is connected to PE via a capacitor

    Resolved
    Part Number: UCC28911 Hello, I use the UCC28911 as shown in the schematic, but it only works if the GND pin of the controller is connected to PE via a capacitor. The VS voltage at a successful start is shown in figure 2 and 3. A failed startup is shown…
    • Resolved

  • RE: UCC28910: Comparison table of UCC28910 and UCC28911

    Hi Kygo, Sorry for the late reply as the post did not show up as "open" in my list of assigned posts. As you explained it mainly depends on power level because of which there are some differences in the electrical characteristics which is clearly…

  • UCC28911: How to disable UCC28911

    TI Thinks Resolved
    Part Number: UCC28911 Customer used UCC28911 for the aux power for the AC-DC PSU. Now they were required to shut down UCC28911 if there was external power supply at the output. Thus, they needed to find a way to disable UCC28911 when required, like MCU…

  • RE: UCC28911: issue of PMP10676

    Hi, Sean and Mike, I am now designing a 15V/300mA high voltage buck with UCC28911, same topology as PMP10767, now it can only output 145mA at less than 80VDC input voltage, if I increase input voltage to >80VDC, then output voltage will drop, and keep dropping…
    • Answered

  • UCC28911: Intermittent Operation

    Resolved
    Part Number: UCC28911 Hello, UCC28911 is used as follows: VIN: 270V ~ 370VDC VOUT: 14V/100mA x3 secondary outputs Lp = 3.3mH Lk = 31uH NPA = 5.51 NPS = 6.96 Schematic is attached. An Intermittent Operation is observed where the chip will work for a minute…
    • Resolved

  • RE: UCC28911: Stops switching

    Hello, The circuit is most likely shutting down due to OCP, OVP or input under voltage fault. The following link will bring you to an application note that describes what the issues with this fault sensing and how to resolve. https://www.ti.com/lit/pdf…
    • Answered

  • UCC28911: Vbrownout voltage

    Resolved
    Part Number: UCC28911 Hi team, Referring to the application note of snva750, the Vbrownout = 43V at the equation (1). Could you give me comment on how to derive the value as 43V? The lowest input voltage looks to be came from 85Vac, and the datasheet…
    • Resolved

  • RE: UCC28911: The maximum output current capability for HV Buck with UCC28911

    One more questions about valley switch mechnisam. Below diagram is capture from UCC28911 datasheet. Base on my understanding, when VDS drop nearby zero means MOSFET turn-on, and I marked three turn on cycle with red circle. I don't understand what the…

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