Answered

• UC2854B: CT pin Max voltage

  

  Steve Widener

  Resolved

  Part Number: UC2854B Other Parts Discussed in Thread: UCC2818 What is the ABS max voltage allowed on the CT pin (for cases where there is an external sync pulse injection)

  • Resolved

  • over 6 years ago
  • Power management
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Answered

• UC2854B-EP: Enable threshold voltage

  

  Koji Hayashi92

  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. …

  • Resolved

  • over 6 years ago
  • Power management
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• UC2854B: GATE PULSE IS NOT COMING ON APPLYING VCC OF +15V.

  

  Navneet Diwakar

  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.

  • over 7 years ago
  • Power management
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• UC2854B-EP: SS Calculation

  

  Satoshi Yone

  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

  • over 7 years ago
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• RE: TINA/Spice/UC2854B: Simulation PSPICE Model

  

  Joe Leisten

  Hans, Unfortunately we do not have and cannot supply a PSPICE model for the UC2854B device. Thanks Joe Leisten

  • over 8 years ago
  • Power management
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• UC2854B: Maximum Supported Switching Frequency

  

  Robert Stowe

  Part Number: UC2854B Other Parts Discussed in Thread: UCC28180 What is the maximum supported switching frequency of the UC2854B? Datasheet page 11, figure 7 implies 800kHz. But TI web selection tool indicates 200kHz. I am currently at Fsw=200kHz for…

  • over 9 years ago
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• UC2854B: Outer Loop Voltage Reference Tolerance

  

  Robert Stowe

  Part Number: UC2854B What is the tolerance for the 3V reference? It appear from the min max values, it is about +/- 2%. Is this correct? Or is it better?

  • over 9 years ago
  • Power management
  • Power management forum
Answered

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

  

  Jose Peeterson20

  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 outer voltage loop…

  • Resolved

  • over 8 years ago
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• 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.

  

  Raven

  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

  • over 6 years ago
  • Power management
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• UC2854B minimum voltage for current limit

  

  Dan Andersen

  Other Parts Discussed in Thread: UC2854B Does the UC2854B have a minimum voltage limit set for current limit? The UC2854B suggests to use 1V across the sense resistor for good noise margin. From the point of reducing power dissipation, it is preferred…

  • over 10 years ago
  • Power management
  • Power management forum

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