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LM5022-Q1: Understanding and Applying Current-Mode Control Theory

abdelrhaffar el hamdi alaoui
Prodigy 50 points
Part Number: LM5022-Q1

HI team, 

 in researcher i use these two documents.

1: SLVAE09B, Feedback Loop Response Considerations in Peak Current Mode Buck Converter Design,

2: SNVA555, Understanding and Applying Current-Mode Control Theory.

to realize a Current Mode Controle CMC, for SEPIC topology all the explications and notes are clear, except the Sampling Gain,

1) why is it modeled in series with the closed-current feedback loop with Rsns or Ri (the current sensing resistor)?

2) what is the object to add it in the schematic block?

thank you, 

  • 0
    TI__Genius 16000 points

    Hi  Abdelrhaffar,

    Thanks for using the e2e forum.

    This topic goes very deep into the loop compensation theory, therefore I am not sure if I can provide a sufficient answer on these questions.
    What was really helpful for me when studying this topic were articles using practical designs with the according calculations, like this one:
    switchingpower_compensation.pdf

    I hope this is useful for you.

    Best regards,
    Niklas