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TPS61379-Q1: Is there any problem to use 2.2uH inductor?

Yoshiki Ochi
Genius 9875 points

Part Number: TPS61379-Q1

Hi team, 

Is there any problem to use 2.2uH inductor? Any issue for loop stability or something?

Regards,
Ochi

  • 0
    TI__Genius 17075 points

    Hi Ochi,

    Inductor choose depends on the frequency and ripple current.

    It influences the loop stability, but it is not the only reason.

    It is recommended to use the calculation tool to have a whole design, or you can refer to the EVM reference design.

    You can also list your conditions and we can design for you.

    Best Regards

    Fergus

  • 0 in reply to Fergus He
    TI__Genius 9875 points

    Hi Fergus, 

    If we use high inductance, current ripple could be <800mA, which is out of range shown in excel sheet. What happen if curfrent ripple is too small?

    Regards,
    Ochi

  • +1 in reply to Yoshiki Ochi
    TI__Genius 17075 points

    Hi Ochi,

    If high inductance is used, it will cause the the right-hand plane zero lower, which may influence the loop gain.

    Higher inductance usually gets larger size.

    Current ripple too small will not any side effect, the range in excel is Inappropriate.

    Regards,

    Fergus