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TPS6213x inductor selection

Aaron Weiss
Prodigy 10 points
Other Parts Discussed in Thread: TPS62130

On page 19 of the TPS6213x datasheet you give a list of recommended inductors, some of which are rated BELOW the static current limit of 4.9A max. If I use one of the inductors, lets say the VLC5045T-3R3N from TDK (rated 3.3nH at 4A), wouldn't there be a chance, at full load, that the inductor wold be overloaded? 

I am using a 3.3nH, 4A inductor and am wondering if I need to switch to one with at least a 4.9A current limit? But you suggest a 4A one in the datasheet.

Thanks,

-Aaron Weiss

SparkFun Electronics

  • 0
    TI__Guru**** 150620 points

    Good eye on a key parameter!

    None of these inductors saturated during our lab testing with the TPS62130.  Also, the TDK inductor you reference doesn't saturate too 'hard' so there's still some inductance left at 4.9A.

    In any case, under a normal 3A load, you should never see a 4.9A current in the inductor with any of these inductors.  If the IC does hit current limit during a fault condition, it will turn off the main switch even if the inductor has begun to saturate.