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Showing 124 results View by: Thread Post Sort by
    Answered

  • UCC28911: Operating voltage and frequency range

    Resolved
    Part Number: UCC28911 Hi Team, Our customer is looking for a reference design of UCC28911 with the following specifications: Input Aux Voltage Range : 50V to 300V AC Operating Frequency : 45 to 65 Hz Required Output Voltage : 3.3V DC Required Output…
    • Resolved
    • Answered

  • UCC28911: Transformer number of turns and size of wire

    Resolved
    Part Number: UCC28911 Other Parts Discussed in Thread: UCC28C45 Hi Team, This is a follow up inquiry to the E2E post below. https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1236904/ucc28911-operating-voltage…
    • Resolved

  • 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

  • UCC28910: Comparison table of UCC28910 and UCC28911

    TI Thinks Resolved
    Part Number: UCC28910 Other Parts Discussed in Thread: UCC28911 , , UCC28881 Hi Team Can you provide the difference between UCC28910 and UCC28911? I only see the maximum power difference that can be handled, is there anything else? THX

  • 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…

  • UCC28911: issue of PMP10676

    TI Thinks Resolved
    Part Number: UCC28911 Other Parts Discussed in Thread: PMP10767 Looks like pin map of UCC28911 is wrong on schematic of PMP10676, pin 6 should be VDD while pin 5 should be VS, right? Thanks Hely
    • 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

  • UCC28911: Stops switching

    TI Thinks Resolved
    Part Number: UCC28911 Hello team, We are going to use UCC 28911 in our design and prepared proto board on UCC28911EVM-718 board by some changes We have some queries regarding the same please address Q1: Is limit for Drain Over current protection [Id…

  • 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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