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LM2596: Inductor Selection

Kazuki Kitajima
Intellectual 1480 points
Part Number: LM2596
Other Parts Discussed in Thread: TPS560430, LMR33610

Hello team!

I got the question about Inductor selection from the customer.

Could you tell me how to select the inductor if the current is below 0.6A?

For the reference, the power line is 24Vin to 5Vout/0.2A.

WEBENCH recommended 330uH for this line. But I would appreciate if your team have any advice for inductor selection.

Best Regards,

Kazuki Kitajima

  • 0
    TI__Intellectual 1480 points

    Hello team,

    Sorry for posting again. But could you tell me one more thing about inductor selection?

    In the DS figure8, L38 section. Inductor would be 68uH/3.1A.

    I'm assuming the current value 3.1A is selected because of the margin.

    Is it okay to use an inductor which has lower current value in case of lower load current?

    The customer would try to use 68uH / 2.5A conductor for 1.67A line.

    Best Regards,

    Kazuki Kitajima

  • 0 in reply to Kazuki Kitajima
    TI__Mastermind 34625 points

    Hi Kazuki,

    Pls follow the instruction on data sheet for inductor selection as the inductor and Cout value are critical for loop stability.

    LM2596 is over capability for 0.2A load current, the inductor also require high saturation current to work with a 3A converter even load is 0.2A.

    can customer try latest LMR33610 or TPS560430 ? 

    B R

    Andy

  • 0 in reply to Andy Chen
    TI__Intellectual 1480 points

    Hello Andy-san,

    Thank you for your reply. LM2596's inductor selection section looks different as the latest devices...

    The DS indicates that inductor value should be selected from the metrics in the DS which doesn't include below 0.6A.

    I understand this device is very old and we have better devices but I would really appreciate it if you would provide some advice for that.

    Also thank you for recommending those devices.

    I'm going to send an e-mail to you directly to explain the customer situation.

    Best Regards,

    Kazuki Kitajima

  • 0 in reply to Kazuki Kitajima
    TI__Mastermind 34625 points

    Hi Kazuki,

    Pls select inductor based on 0.6A load current.

    If design inductor based on 0.2A load current, it maybe 3X bigger than 0.6A load condition, the too big inductor will cause loop stability issue.

    B R

    Andy

  • 0 in reply to Andy Chen
    TI__Intellectual 1480 points

    Andy-san,

    Thank you for your reply!

    I'll tell the customer to refer to the 0.6A point in the figure.

    Best Regards,

    Kazuki Kitajima