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LM2596: Inductor selection

Y.Ottey
Mastermind 6145 points
Part Number: LM2596

Dear all,

Our customer would like to know about contents of  LM2596's datasheet.

Could you answer the following questions?

The specifications of the customer's power supply are as follows.

Device: LM2596-12

Input voltage: DC20 to 32V

Output voltage: 12V

Output current: max 0.8A

The conditions for a maximum input of 32 V and a maximum current of 0.8 A can be written as shown below (Datasheet p.19 "Inductor selection" Figure 29).

By the way, when I investigated using WEBENCH, the value of the inductor became a result of 270μH as follows.

There are differences with the data sheet values, but which one is correct?

 Best Regards,

Y.Ottey

  • 0
    TI__Guru 73842 points

    Hi Y.Ottey,

    My recommendation is to follow the datasheet guidelines.

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    Mastermind 6145 points

    Dear Tim

    I will follow the data sheet guidelines.

    I have one more question.

    As shown in Figure 29 in the data sheet, in the case of customer's specification conditions, it is possible to select in the range of L27 for 20V and the range of L27 or L28 for 32V. 

    If it is your specification, can you tell me which one to choose from?

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Mastermind 25590 points

    Y.Ottey,

    You can select either inductor if the selection is on a line between inductors. The performance will be slightly different for the two values but the part will still operate assuming the rest of the schematic/layout is adequate.

    I'd recommend using the lower value inductor. This will save cost and/or size in your system. You can move to the higher value if necessary after testing.

    -Sam