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  • UC3854A: Buck PFC - Application note

    TI Thinks Resolved
    Part Number: UC3854A Other Parts Discussed in Thread: UCC29910A Tool/software: I wanted to use UC3854A as a Buck PFC controller, utilizing its power limit feature. Upon following the application instructions DN-66, I can't seem to regulate the output…

  • UC3854A: Current sense resistor selection

    TI Thinks Resolved
    Part Number: UC3854A Other Parts Discussed in Thread: UC3854 , Tool/software: We are building a circuit based on the UC3854. Input current up to 20A, will result in a substantial dissipation on the current sense resistor. Normally for the smaller converters…

  • UC3854: UC3854 vs UC3854A differences

    TI Thinks Resolved
    Part Number: UC3854 Hello, customer is searching for a drop-in-alternative (or ptp) for the UC3854DWTR. Can he use the UC3854A? What are the differences? Regards, Holger

  • UC3854A: UC3854A: INPUT CURRENT IS DISTORTED AND HAS LARGE SPIKE AT ZERO CROSSING

    TI Thinks Resolved
    Part Number: UC3854A Hi John, I saw my customer engineer Xu hong in US contacted with you in E2E, Since Xu hong is my customer engineer he didn’t buy TI parts but checking for technical issues, I guess he didn’t talk to you about the orders I placed…
    • Answered

  • RE: UC3854A: Buck Converter using UC3854A

    Resolved
    Dear Wangxin, First of all thanks for your quick response to my query. But I would like to know about, configuring UC3854A for buck converter.

  • RE: UC3854A: INPUT CURRENT IS DISTORTED AND HAS LARGE SPIKE AT ZERO CROSSING

    Hi John, The suggestion for removing R38 does not work. I removed R38, the zero cross spike is still there. However, I am making progress by double the Iac current which seems help. I think at the data sheet of UC3854A page 8, the recommended…

  • UC3854A: Recently, we have found UC3854ADW, TI on our PCBA does not work properly.

    Part Number: UC3854A Hi John, I saw my customer engineer Xu hong in US contacted with you in E2E, Since Xu hong is my customer engineer he didn’t buy TI parts but checking for technical issues, I guess he didn’t talk to you about the orders I placed…

  • RE: UC3854A: AC TO DC

    Hello Samrat, The UC3854A can be used in a 3 phase application by using a 3 phase (6 diode) bridge rectifier and designing the UC3854A on the DC side of the bridge. This is similar to a single phase (4 diode) application. Unfortunately I do not have…

  • UC3854A: current peaks at zero-cross

    Other Parts Discussed in Thread: UC3854A Hello. I am using UC3854A for 2500W PFC. I have encountered a problem of large current peaks on zero-cross. The amplitude of peaks depends on the value of Rmo & Rci - the larger the value, the larger the amplitude…

  • uc3854a current sensing using transducer?

    Other Parts Discussed in Thread: UC3854A , UC2854 Hi genius, AC/DC boost converter with PFC controller. Input : 180-270Vac Output Power = 6kW Output voltage = 400 vdc Output Load = 15A PFC controller chosen = UC3854a My question is, How…

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