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  • UCC28720: Lower inductance

    Part Number: UCC28720 Hi, At the top of page 19 of the datasheet, there is a formula that calculates Ls. Is the value of Ls critical? Can it be less than what is calculated? Because the value found is very high (8mH while transformers good for a similar…

  • UCC28720: Constant current control application

    TI Thinks Resolved
    Part Number: UCC28720 Other Parts Discussed in Thread: DRV110 Hi, Can we use UCC28720 for constant current control application (example: solenoid control). Is it possible to disable the voltage control loop and use only the current control loop.
    • Answered

  • UCC28720: Weird waveform at turn-off of the controller UCC28720

    Resolved
    Part Number: UCC28720 Other Parts Discussed in Thread: UCC28710 I made a Flyback using UCC28710. It works well. I replaced the controller by UCC28720. According to two datasheets, there is no many difference between two controllers such as maximum switching…
    • Resolved

  • UCC28720: UCC28720 and current sense resistor damaged

    TI Thinks Resolved
    Part Number: UCC28720 Hi, We are using UCC28720 as per attached image below. In few of the power supplies, we found Parts R91, R92 ( Current Sense resistors), U1 ( Switcher) , T1 ( Transistor connected to the switcher drive) and R2 ( Transistor Base drive…

  • UCC28720: The power supply output voltage is good with no load, but drops the voltage when loaded

    TI Thinks Resolved
    Part Number: UCC28720 Hello, I copied the reference design inside UCC28720 datasheet, including same part numbers for discrete. The design gives the expected output with no load connected, and when a 10 ohm load is added the voltage drops to zero with…

  • UCC28720: Can we design?

    TI Thinks Resolved
    Part Number: UCC28720 Other Parts Discussed in Thread: UCC28722 , UCC28880 , UCC28910 Can we design 5V, 0.5A isolated power supply module with this IC? If i try with TI Webench it shows that junction temperature lower than ambient temperature. Please advise…
    • Answered

  • UCC28720: 7.5W design referring UCC28720EVM-212

    Resolved
    Part Number: UCC28720 Customer wants to design a 5V 7.5W application referring the EVM. Is it enough change that only current sense resistance is changed from 2.15 ohm to 1.56 ohm, using the same transformer with Lp=1.5 mH and turns ratio of 15.42:1? …
    • Resolved
    • Answered

  • UCC28720 Design not working!

    Resolved
    Other Parts Discussed in Thread: UCC28720 , UCC28720EVM-212 , UCC28700 , UCC28704 , UCC24636 , UCC28730 , UCC24650 Hello, I've re-created the UCC28720-EVM on my own circuit card, emulating everything "almost" exactly - placement and layout is very very close…
    • Resolved
    • Answered

  • LM5023: Operational Frequency Range and Compensation Question

    Resolved
    Part Number: LM5023 Other Parts Discussed in Thread: UCC28740 , UCC28720 I generated a Mathcad sheet for datasheet example. Then updated it with my design. I am noticing that my High line (275vac and 400vdc) Frequency at current limit , I am above 130khz…
    • Resolved
    • Answered

  • UCC28720 / R4 on the figure 30

    Resolved
    Other Parts Discussed in Thread: UCC28720 Hi, I received the following question from my customer. There is the R4 on the figure 30 of the datasheet. Is this resistor for VDD filter? Could you show me how to calculate this resistor? Best Regards, Kuramo…
    • Resolved

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