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  • UCC28634: AUX Winding Ringing

    Resolved
    Part Number: UCC28634 We are designing a high voltage DC-DC flyback converter using the UCC28634 controller. The circuit is currently operational (starts up and somewhat regulates), but is not functioning properly due to excessive ringing on the AUX winding…
    • Resolved

  • RE: UCC28634: No output on the secondary

    Hello Jagadish, Thank you for your interest in the UCC28634 flyback controller. For a flyback topology, the transformer symbol in the Altium schematic that you posted has the CORRECT polarities shown for each winding connection. In other words, the…

  • RE: UCC28634: 900 - 2000Hz input 3 phase supply

    Hi Murali, Thanks for reaching out. Yes the calculation tool can be used for 300Vrms input. The excel calculation tool is recommending 2uF/W of nominal output power. If you update cell E12, the recommended input bulk capacitance should update as well…

  • UCC28632: Off the shelf transformer

    Part Number: UCC28632 Other Parts Discussed in Thread: UCC28634 I'm trying to use the webench to design a 120VAC to 24VDC power supply. I must have clicked through at least 25 designs at this point, and all of them seem to share the same transformer topology…
    • Answered

  • UCC28633: Malfunction in low power situation

    Resolved
    Part Number: UCC28633 Other Parts Discussed in Thread: UCC28634 , UCC28631 Dear Sirs. We have designed a flyback conveter using the UCC28633 with a defined output of 65V following the recomendations from corresponding technical notes. But we are having…
    • Resolved

  • RE: UCC28630: UCC28630 Fsw selection and simulation model

    Hi Mike, Thanks for your reply. Also, customer is considering DC HV start up, can you help clarify the difference between UCC28631 and UCC28634? Thank you！ Regards Yunjing

  • UCC28631: Problem with start up

    TI Thinks Resolved
    Part Number: UCC28631 Other Parts Discussed in Thread: UCC28634 , , UCC24612 , UCC24610 , UCC28630EVM-572 I am currently running a UCC28631 but after a short interruption of the mains, it will not restart until the bulk DC has bled to almost zero or Vcc…

  • RE: WEBENCH® Tools: require AC to DC converter and DC to DC converter which gives 2 selectable outputs

    Hi Jayaprakash, We currently do not support multi-output power supply designs in new WEBENCH power designer tool. Alternatively, you could design each output separately. Could you please let us know if application for DC to DC converter is isolated…

  • UCC28630EVM-572: Flyback wont work

    TI Thinks Resolved
    Part Number: UCC28630EVM-572 Other Parts Discussed in Thread: UCC28631 , UCC28630 , UCC28634 Dear TI, I am trying to design a housekeeping power supply for one of our products. Requirement: Input: 260 Vdc to 710 Vdc Output: 12 V @ 1.5 A max. …
    • Answered

  • RE: UCC25702: Practical Recommendations for pc board lay-out

    Resolved
    Hello Gerald, PCB layout is an important topic for SMPS and many application notes and datasheets address this issue. General discussions on SMPS layout: https://www.ti.com/lit/an/snva021c/snva021c.pdf?ts=1661802120154&ref_url=https%253A%252F%252Fwww…

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