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LP8860 Question of FB

Kei Sato73562
Expert 2310 points

Hello,

I have some question of LP8860

Q1

There is a capacitor of C18 in LP8860EVM.

What is C18 for?

Q2

There is resistance of R15 in LP8860EVM.

What is R15 for?

 

Best Regards,

Kei

  • 0
    TI__Prodigy 460 points

    Hello Kei.

    Kei Sato73562 said:

    There is a capacitor of C18 in LP8860EVM.

    What is C18 for?

    C18 is for suppression of high frequency noise, it is not mandatory for real design if PCB is designed properly and boost COUT is close to FB pin. But I recommend to leave this capacitor and place it as close as possible to FB pin.

    Kei Sato73562 said:

    There is resistance of R15 in LP8860EVM.

    What is R15 for?

    R13 and R15 are useful for network analyzer connection to measure phase margin.

    In real design they are useless.

    Best regards,

    Vladimir