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TPS53319: Regarding inductor used at the input of power supply

Siddhi Sawant
Prodigy 165 points
Part Number: TPS53319

Hello,

This is regarding the 5V supply to HDD in Open compute project "Bryce Canyon" in which the ferrite bead is used at the input of DC-DC converter (12V to 5V) as shown in the schematic.
I have attached reference schematic for TPS53319.

Where as, some other reference designs have used inductor for the same power supply.

Can you clarify whether to use inductor or ferrite bead and how to select the values/parts.

BRYCECANYON_FRONT_DPB_OCP_2011207.pdf

  • 0
    TI__Genius 16640 points

    Ferrite beads are classified as an inductor, but the impedance characteristics vs frequency are different than wired inductors.

    Ferrite beads have a high resistance and a low Q value and are lower cost than a wired inductor.

    The ferrite bead is effective as a noise filter over a relatively broad range of frequencies.

    A Wired Inductors impedance is not affected much by the dc current, are low loss and have a high Q.

    A well damped LC (low Q) is a preferred input filter to minimize the issues discussed in the following app note.

    https://www.tij.co.jp/jp/lit/an/snva801/snva801.pdf