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  • UCC28781EVM-053: What does Q100 in EVM do?

    Resolved
    Part Number: UCC28781EVM-053 Other Parts Discussed in Thread: UCC28781 Hello TI, Could you please explain how does Q100 work and what is it for? Can it be replaced with BC807-25LT1G ? https://www.onsemi.com/pdf/datasheet/bc807-16lt1-d.pdf Thank you in…
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  • UCC28781-Q1: XCD and P13 pins when only DC input is used

    Resolved
    Part Number: UCC28781-Q1 Other Parts Discussed in Thread: UCC28781EVM-053 HI TI, We are building a board based on UCC28781EVM-053 where only DC input is used.- Does that mean we should not include the marked block, also ground the XCD signal? Thank you…
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  • UCC28781-Q1: Transformer inductance calculation

    TI Thinks Resolved
    Part Number: UCC28781-Q1 Other Parts Discussed in Thread: UCC28781EVM-053 , Hello TI, We are doing calculations on a design that should have 650-900Vin and 68V 0.6A output. I have never seen transformers with inductance in 10mH range. Is our calculation…
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  • UCC28782EVM-030: Minimum working input voltage

    Resolved
    Part Number: UCC28782EVM-030 Other Parts Discussed in Thread: UCC28782 , , UCC28781EVM-053 This EVM states 90Vrms minimum input voltage, what happens at lower input voltage? Can this IC be used at 60V input?
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  • UCC28781: DC/DC isolated 30W 5V output

    TI Thinks Resolved
    Part Number: UCC28781 Other Parts Discussed in Thread: UCC28782 , , UCC5304 Hi, I want to design a with following specifications: Input voltage: 30V-200V (if too wide, can be made in two options, 30V - 90V, 80V - 200V) Output voltage: 5V 6A Currently,…
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  • RE: UCC28781: Voltage input range

    Resolved
    Hello Valentinas, Yes, the IC can be used to control a ZVS Flyback converter with a 40V-900V input range. I am assuming that this is a DC input, not AC. The IC is not connected directly to such voltages, however, it has signal inputs to which scaled signals…
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  • RE: UCC28781: Does not start up

    Resolved
    Hello Valentinas, Thank you for the additional information. It is going to take me a little while to analyze it all and provide some meaningful guidance. But let me address your last question first. I agree with your RDM calculation and you do have a…

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