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  • UC2854B-EP: Enable threshold voltage

    Resolved
    Part Number: UC2854B-EP Hi TI-team My customer is using UC2854B-EP. Normally, I think ENA operates at 2.35V or more. However, there is a sample that operates with ENA around 1.9V. VCC at this time is about 10.5V. Vref also outputs 7.5V. Why does the…
    • Resolved

  • UC2854B: UC2854B PFC parallel mode output

    TI Thinks Resolved
    Part Number: UC2854B Hi, I need a large watt PFC output application, If UC2854B is parallel mode synchronize output, pin 14 (CT) can be connected together? As shown, what risks exist?! Thank you!

  • UC2854B: I have changed every parameter to improve PF ar 220V which was 0.93 with a 1KW load， It seemed every parameter ha no effect. Whenever I added load, only the peak wave was not ok.

    TI Thinks Resolved
    Part Number: UC2854B I changed the Vloop paramer, Iloop parameter,Vrms parameter, Iac parameter, Frequency parameter, Isense parameter, But PF was still the same when I added to half load which was 0.95

  • UC2854B-EP: SS Calculation

    TI Thinks Resolved
    Part Number: UC2854B-EP Hello, Team, My customer is using UC2854BMDWREP. They plan to change SS capacitor from 0.01uF to 22pF. Could you please let me know the equation for SS calculation? Best Regards, Satoshi Yone

  • UC2854B: GATE PULSE IS NOT COMING ON APPLYING VCC OF +15V.

    TI Thinks Resolved
    Part Number: UC2854B MOUT PIN IS GROUNDED THROUGH RESISTOR Rmo= 1.13k Cao pin is at 0V. Gate pulse is not coming. Please suggest.

  • UC2854B-EP: How to improve PF and current harmonics for 115Vac application at 600hz to 900Hz line frequency range

    TI Thinks Resolved
    Part Number: UC2854B-EP We need to improve PF and current harmonics performance for PFC converter during 122vac and line frequency range of 500hz to 900hz. Converter details Input: 100V to 122Vac, 400hz to 900hz sinewave / Output : 215Vdc, 150W / Fsw…

  • UC2854B-EP: Is Rb1 required with the B version of the part?

    TI Thinks Resolved
    Part Number: UC2854B-EP Section 9.2.2.9 of datasheet (SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015) discusses connecting a resistor (Rb1) from Vref to pin 6. Page 5 of SLU177A (Revised December 2005) seems to indicate that this resistor …

  • UC2854B-EP: How to calculate Rsp resistor using current transformer with positive output

    TI Thinks Resolved
    Part Number: UC2854B-EP In this document on page 16 figure 11. I'm not able to find how to calculate the value Rsp? Is the resistor Rsp the same value as Rs?

  • TINA/Spice/UC2854B: Simulation PSPICE Model

    Part Number: UC2854B Other Parts Discussed in Thread: TINA-TI , Tool/software: TINA-TI or Spice Models Hello Team, can you provide a PSPICE model for the UC2854B, please? Thanks and Best Regards, Hans
    • Answered

  • UC2854B: Control loop tuning, PFC, OUTER VOLTAGE LOOP, VOLTAGE DROP, PEAK CURRENT,

    Resolved
    Part Number: UC2854B Other Parts Discussed in Thread: UCC28070A Hi, Can I also ask if the overshoot in the PFC output voltage after a peak current draw can be reduced by increasing the DC/Low frequency gain of the total compensated…
    • Resolved

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