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TPS61096A: Wants to know the inductor selection

Koki Tsushima
Prodigy 695 points
Part Number: TPS61096A

Hi expert, 

This is Koki Tsushima.

My customer wants to know the proper inductance value.

Q.1

What is the meaning of the minimal of the last sentence?  - Is it the recommended min, which is 1uH?

Q.2

Is this calc.(3)  the formula for calculation of peak inductor peak current?

 Q.3

On the EVM, it was used for 1.5A inductor. But customer wants to adopt inductor for lower current for ILIM : 500mA. 

Is it OK?

Best regards,

Koki Tsushima

  • 0
    TI__Mastermind 34201 points

    Hi Koki,

    Q1: Yes, the recommended min value is 1uH.

    Q2: The equation (3) calculates the maximum switching frequency. The inductor peak current is selected by ILIM pin.

    Q3: It's OK to use this 1.5A  inductor for lower current for ILIM: 500mA

  • 0 in reply to Zack Liu
    TI__Prodigy 695 points

    Hi Liu-san,

    Thank you for perfect answer.

    Let me ask again.

    Q.4 If user wants to use ILIM=high (= 500mA), what is the min of rated current of inductor?

        Because user has to select the bigger than ILIM as follows, therefore, is it 600mA?

     

    Q.5 Do you have any other concerns for selecting L such as delay detection time etc.?

    Best 

    Koki Tsushima

  • 0 in reply to Koki Tsushima
    TI__Prodigy 695 points

    Hi Liu-san or other BUs,

    I will wait by end of NEW Chinese year season.

    Could you answer after that?

    Best,

    Koki Tsushima

  • +1 in reply to Koki Tsushima
    TI__Genius 9046 points

    Hi Koki-san,

    Please kindly refer to my comments below:

    Q.4 If user wants to use ILIM=high (= 500mA), what is the min of rated current of inductor?

    [WW]The minimum inductor saturation current rating should be 0.6A+some margin. Typically I choose 20% margin.

    Q.5 Do you have any other concerns for selecting L such as delay detection time etc.?

    [WW]I did not see relation between inductor selection and delay detection from inductor selection.

    -Wenhao