• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 342 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.

LM60430-Q1: Inductor value for light loads

Mark Guastaferro
Genius 11645 points
Part Number: LM60430-Q1

I'm trying to figure out how large of an inductor value can be used with the LM60430-Q1 when the max load current is under 500 mA?

Using Webench, it recommends 10 uH, while the Quick Start calculator reports 60 uH. I'm worried that 60 uH is too large for the internal compensation, but 10 uH seems too low. I expect the converter will be in PFM mode with this light load, but want to see if I can raise the PFM frequency some.  

  • 0
    TI__Mastermind 35210 points

    10uH is satisfactory for "good" transient performance across load range. It would be naive to select 60uH in accordance to 30% inductor ripple equation for pfm load, considering the fact, inductor ripple in pfm is a function of pretty much only IC controller design.

    If you are trying to achieve deterministic swithing frequency at light load you are better off choosing FPWM device, assuming you have a large peak current demand.