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TPS54560: the selection of inductor saturation current

Jason Dai
Expert 3720 points
Part Number: TPS54560

Hello E2E,

I would like to consult how to correct to select the inductor's saturation current.

The OCP of TPS54560 is fixed. Assume the maximum load current is just 1.5A and due to PCB size limitation, could user use the lower saturation current than OCP but higher than maximum current rating?

Jason

  

  • 0
    TI__Guru 57555 points

    It is always best to design the inductor for the current limit of the device.

    However, it is OK to use an inductor with a saturation current less than the current limit.

    Some inductors have a very hard saturation characteristic.  That means that the inductance will

    drop to a very low value when saturation is reached.  That kind of inductor should be avoided.

    Most inductors will exhibit a gradual drop in inductance as saturation is approached.  I would use one

    of these.  If you need 1.5A of load, I would look for an inductor rated for at least 2A of rated current.  Then 

    find one with the highest saturation current that will fit on your PCB.  The larger the current rating, the lower

    will be the resistance and the better will be your efficiency.

    If all you need is 1.5A of load, you may want to use a regulator with lower current capability.

  • 0 in reply to Frank De Stasi
    TI__Guru 57555 points

    Hello

    I will close this post due to inactivity.

    Thanks