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  • UCC28742: Line frequency ripple in output

    TI Thinks Resolved
    Part Number: UCC28742 Hi team. When the bulk capacitor is small, there are line frequency(60Hz) ripple in output, which is caused by limited duty cycle. I think it should be 120Hz. Is there any wrong? Br, Nison

  • RE: WEBENCH® Tools/UCC28742: UCC28742 High voltage DC to low voltage DC isolated output

    Hi Hong, Here are the scope measurements with: CH1 - MOSFET gate pin CH2 - VDD CH3 - CS CH4 - Aux output on XFMR All channels share a single point GND reference to COM. I have noticed another issue I am seeing, that the circuit is not starting up…

  • RE: WEBENCH® Tools/UCC28742: UCC28742 High voltage DC to low voltage DC isolated output

    Can you open a new thread and provide the waveforms you have to e2e so we can know what they look like.
    • Answered

  • UCC28742: SMPS stops working at start-up

    Resolved
    Part Number: UCC28742 Hello Everyone, I have a problem with my Flyback SMPS using UCC28742. I see that there is a several switching periods at start-up and it stops working after about 20ms. There is enough CDD because the switchings are stopped…
    • Resolved

  • UCC28742: Open feedback output drive issue

    TI Thinks Resolved
    Part Number: UCC28742 I’m currently working on a Flyback design & using UCC28742. I’m now testing for a particular condition called open feedback response. Basically, this is a test where I would be checking the output overvoltage limits. System is…

  • UCC28742: 5V Output Voltage

    Part Number: UCC28742 Other Parts Discussed in Thread: UCC28782 Hello TI-Team, I want the Simplis Simulation to work at 5V Output. I used the Datasheet and the Excel Table for calculation. But the Output Voltage still is 20V. www.ti.com/.../sluj001…

  • RE: WEBENCH® Tools/UCC28742: UCC28742 High voltage DC to low voltage DC isolated output

    Hi Clint, I would suggest retaking the measurement using a tip and barrel probe. There appears to be a lot of ringing in the measurements which can be caused by the ground clip of a passive probe. The amplitude of the CS waveform is way too big. If…

  • UCC28742: Removing Auxiliary winding

    TI Thinks Resolved
    Part Number: UCC28742 Hi hope you be well i want to design a 10w DC-DC converter (Flyback topology) using UCC28742. since my input voltage is only 24v (for further information output is 5v) i was wondering if i could remove auxiliary winding and instead…
    • Answered

  • UCC28740: The major difference between UCC28740 and UCC28742?

    Resolved
    Part Number: UCC28740 Other Parts Discussed in Thread: UCC28742 Hi Teams I am seeking a 85~230AC to 24V/75W solution for customer. And both UCC28740 and UCC28742 is my candidate. My first questions is which part more sutiable for highe power level…
    • Resolved
    • Answered

  • RE: UCC28742: What is UCC28742? Why should you choose it?

    Resolved
    Have you struggled to find the best controller for your sub 45W AC/DC power supply where the only obstacle seems to be cost? Maybe you’ve found controllers that offer great performance, but include additional features that only serve to drive the cost…

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