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  • UCC28704: can it support DC input voltage up to 450V?

    TI Thinks Resolved
    Part Number: UCC28704 Customer is looking for a PSR flyback controller for their aux power. The input is from their PFC output, so the input voltage range might from 300V to 450V. Could you please help check whether UCC28704 or other better proposal can…

  • UCC28704: Selection of Primary Side Regulated (PSR) Fly-back controller

    TI Thinks Resolved
    Part Number: UCC28704 Hi Team, We would like to ask your help regarding the customer's inquiry below. Background: I have used the UCC28704, but there is a problem: I need to reduce the impedance of the signal at Vs (pin 6), but I cannot do this because…

  • UCC28704: UCC28704 switches on and off continuously

    TI Thinks Resolved
    Part Number: UCC28704 Hi, I designed a flyback converter with the UCC28704. I am using the transformer 750811613. The output of the converter should provide one output of 12V and 1 output of 5V while the auxiliary output should be 20V. Unfortunately, the…

  • UCC28704: Calculation for minimum demag time

    TI Thinks Resolved
    Part Number: UCC28704 Dear TI Experts, Refer datasheet: SLUSCA8A –FEBRUARY 2016–REVISED FEBRUARY 2016) I need to calculate the shortest Tdemag (time when the UCC28704 will sample the Vs pin after turn-off of MOSFET), refer datasheet Fig 14…

  • UCC28704: UCC28704

    TI Thinks Resolved
    Part Number: UCC28704 Hi, I am working on flyback converter with the chip UCC28704. The chip turns-on well, producing 13V output. But a few msec later it sends pulses at 170kHz or more, with very short duty cycle, even though the max switching freq of…

  • UCC28704: PSpice for TI - default model isn't working for transient analysis.

    TI Thinks Resolved
    Part Number: UCC28704 Other Parts Discussed in Thread: UCC28700 , Hi team, My customer is trying to simulate this part on PSpice for TI and it's not starting. Is there anything wrong with this? This is the default set up provided by PSpice for TI.
    • Answered

  • UCC28704: PMP11600 Design Queries

    Resolved
    Part Number: UCC28704 Other Parts Discussed in Thread: PMP11600 I need support for UCC28704 based PMP11600 design. In the design I don't see any provision for over voltage protection for SMPS. Do you have any reference which will help to turn off…
    • Resolved
    • Answered

  • UCC28704: Schematic Review

    Resolved
    Part Number: UCC28704 Hi Team, I have a customer that is interested in having their schematic reviewed to make sure everything is good to go for production. Could someone please reach out to assist here? Thank you. Best, Dajon McGill
    • Resolved

  • UCC28704: UCC28704: Start up Issue when powered on with 110V ac supply - II

    TI Thinks Resolved
    Part Number: UCC28704 Hi Team, As per the suggestion , we have tried reducing the start up resistors with 5ME(initially it was 10ME) and also tried some combination of resistors(reduced values) to check if the VDD voltage is high (21V) but it is stabilizing…
    • Answered

  • UCC28704: Trans

    Resolved
    Part Number: UCC28704 Dear team, The result of the transformer calculation of the datasheet (Lp=5mH, NPS=13) and results of WEBENCH are different. Which should I design? WBDesign3_7V0.7A_120-250Vin.pdf Regards, PAN-M
    • Resolved

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