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UCC28180: circuit design of 2kw PFC using sluc506c file

winston choe
Prodigy 30 points
Part Number: UCC28180

Hi~~

I have two question about using sluc506c.

first..

Design 2kw PFC that is refer from TIDA00779.

Tida00779 using switching frequency 45KHz, so I write 45 at sluc506c's C38. 

Then the graph about "M1M2 vs VCOMP" at A157 is changed. M1M2 maximum value is about 1.4.

That's right?

second

when calculate "current sense resistor", "Ideal Value for RSENSE, for 110% Inductor SOC Threshold:" is 0.013 ohm.

But I write "0.013" at C117, waring message is on E14.(DECREASE Rsense) 

I calculate Rsense based on datasheet of UCC28180, the value of Rsense is 0.013.

please confirm problems.

have a nice day.

  • 0
    TI__Genius 9790 points

    Hi, Winston

    1. question1: M1M2 value change as along as switching frequency is right.

    2. question2: UCC28180 is designed for universal input 85V~264Vac. So the current shunt should be calculated with 85Vac. If you calculated at 176Vac, the ICOMP would be saturated and the input current would be distorted.

    BR,

    Yunsheng