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  • UCC28740: Can't open SIMPLIS model

    TI Thinks Resolved
    Part Number: UCC28740 Tool/software: Hi Expert, Customer download the UCC28740 SIMPLIS model, but there is an error when they try to open it. Can you help solve it?

  • UCC28740: Abnormal Output During Fault Test

    TI Thinks Resolved
    Part Number: UCC28740 Tool/software: Hi Team, Customer use UCC28740 in parallel, and when they doing fault test - input power supply failure, then found one of the device cannot re-start work. Below is the waveform blue is normal UCC28740 output, green…

  • PMP41031: Technical Inquiry Regarding UCC28740 Application in Flyback Converter Design (300-1500V Vin, 24V Vout, 500W)

    Part Number: PMP41031 Other Parts Discussed in Thread: UCC28740 , Tool/software: Dear TI Engineers, I'm currently designing a flyback converter using the UCC28740 controller, referencing the PMP41031 design, with the following specifications: Input…

  • UCC28740: Circuit review and issue support privately

    TI Thinks Resolved
    Part Number: UCC28740 Tool/software: Hello, My customer designed a Flyback circuit with UCC28740. They are having issues with FET switching noise. Could you please provide a review of the circuit and support for the issue privately? Thank you. JH

  • UCC28740: how to fix the output voltage is 12v whenever the input is AC 110V or AC220V

    TI Thinks Resolved
    Part Number: UCC28740 Tool/software: hi sir we follow the TI reference design, use the UCC28740 to generator the 5V & 12v, but when vin is AC 110V, Vout 5v,12v is stable when vin is AC 220V,Vout 5v, stable, but 12v change to 24v, it's right?…

  • UCC28740: Protection function may stop oscillation at startup_No.2

    TI Thinks Resolved
    Part Number: UCC28740 Tool/software: Hi. Sorry I closed the thread, but I need to ask the question again. As for RC snubber, I'll give it a try. But which protection do you think is working for shutting down the IC by this ringing? OVP? or UVLO? …
    • Answered

  • UCC28740-Q1: No PWM Output with 24V VDD

    Resolved
    Part Number: UCC28740-Q1 Other Parts Discussed in Thread: UCC28740 Tool/software: Dear TI Support Team, I am currently working with the UCC28740-Q1 in my application and have encountered an issue. I applied 24V to the VDD pin of the IC, but I observed…
    • Resolved
    • Answered

  • UCC28740: Protection function may stop oscillation at startup

    Resolved
    Part Number: UCC28740 Tool/software: Hi.Team In circuits using the UCC28740, in very rare cases, the oscillation may stop and restart when the power supply starts up due to the protection function. I need to know if there is any way to prevent this phenomenon…
    • Resolved

  • UCC28740-Q1: UCC28740-Q1 and 2. UCC28730-Q1

    TI Thinks Resolved
    Part Number: UCC28740-Q1 Tool/software: Hello We are planning to use, UCC28740QDRQ1 and UCC28730QDRQ1 in our design, But we need it to operate over a temperature range of -55 to 150degC . But as per datasheet recommended operating temp is given as -40 to…
    • Answered

  • RE: UCC28740: Flyback Converter Output Voltage Drop Issue at High Load

    Resolved
    Sorry for the delayed response. After increasing the input voltage from 650V to 750V and adjusting the VS pin R285 to below 30k, the output voltage did not decrease and operated normally. Thank you.
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