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LM5175: LM5175: Accuracy of the pole/zero selected in the Quickstart Calculator

Part Number: LM5175

Hi,

I am trying to understand whether the my compensation network (Rc, Cc1 and Cc2) have been properly selected as to ensure optimum design stability and performance during Buck-Boost modes of operation. The values I ended up selecting were extracted from the LM5175 Quickstart Calculator and can be found below:

Rc = 3kOhm;

Cc1 = 22nF;

Cc2 = 0pF.

P.S: I am also trying trying to understand how the poles/zeros created by them is having in the Bode Plot in my calculator. 

3. LM5175 Buck-Boost Quickstart Tool -- r9.xlsm

  • Hello Sergio,

    The calculations in the calculator are based on the formulas in the datasheet.

    The result is a starting point and needs to be tested on the produced board as parasitics cannot be estimated properly with a calculator.

    Best regards,
    Brigitte