• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 226 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS61379-Q1: Inductance value

Oba
Genius 17365 points
Part Number: TPS61379-Q1

Hello,

My customer would like to use 10uH inductance in thier design and are seeing TPS61379-Q1 as one of candidates.
Table 9-2 in the datasheet shows 0.45 ~ 1uH for recommended inductors.
Can 10uH be used for this device?

Regards,
Oba

  • 0
    TI__Mastermind 19110 points

    Hi Oba,

    What's the switching frequency and the mode that customer uses?

    Regards

    Lei

  • 0 in reply to Lei Zhong
    TI__Genius 17365 points

    Hello Lei,

    They don't still have any idea for both switching frequency and the mode.
    They just want to reuse 10uH that is already on their AVL.

    Regards,
    Oba

  • +1 in reply to Oba
    TI__Mastermind 19110 points

    Hi Oba,

    Here are the two general rules to judge whether 10μH can be used for TPS61379:

    • If it works in PFM mode, the inductor ripple should be bigger than 800mA;
    • If it works in PWM mode, 10μH should work, but it's better to check that the right-half-plane zero is still at least 5 times bigger then the crossover frequency. The TPS61378 calculation can be used for TPS61379.  

    Once customer provides more detailed work conditions, I can also take the more careful check.

    Regards

    Lei