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A
anubirux
Visitor II
July 21, 2015
Question

ST1S40 maximum inductance.

  • July 21, 2015
  • 1 reply
  • 653 views
Posted on July 21, 2015 at 11:07

Hello,

I design DC-DC converter using eDisign and I make it with folowing parameters:

Vin = 11-14 V

Vout = 5 V

Iout = 700 mA

Design software limits maximal inductance for this IC to 10uH, but then IL ripples are quite big ( around 50%). Can I use it bigger inductance for this IC or it's not possible ? I didnt see any information about it in data sheet.
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    1 reply

    N
    Nickname5621_O
    Visitor II
    July 28, 2015
    Posted on July 28, 2015 at 11:24

    Hello,

    the e-design is an automatic tool that allows the user to easily realize an application.

    The tool is utilized to match a lot of different conditions but, to don't increase its complexity, it has been necessary to establish some conditions for the power components.

    The condition you have seen on e-design is due to the implementation of the tool, not to a limitation of the device.

    The official technical document of the device is the datasheet, following the equations reported it's possible define a working application with a coil value bigger than 10uH.

    Following your specs:

    -> Vin = 11-14 V

    ->Vout = 5 V

    -> Iout = 700 mA

    I have realized on the evaluation board of the device the attached application.

    Best regards.

    ________________

    Attachments :

    Application.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HzDB&d=%2Fa%2F0X0000000bIR%2FlVjVDLeFq8vhTFjOFuwPNVtywBSOBJLT16PkET7szP4&asPdf=false
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