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LM51561H-Q1: LM51561H-Q1

karthik j
Prodigy 20 points
Part Number: LM51561H-Q1

HI,

   I am planning to use LM51561HQPWPRQ1 IC as SEPIC regulator. I like to know whether this IC supports for both below operating condition,

Condition 1: 

Vin = 9V to 16V

Vout = 9V

Iout = 500mA

Condition 2: 

Vin = 9V to 16V

Vout = 6V

Iout = 500mA

In WEBENCH, i am not able to derive circuit for 6V Vout as tool gives error like output voltage must be within Vin min(9V) and Vin max(16V) range. Let me know whether this is WEBENCH tool limitation or IC limitation.

Also let me know if there are some reference design for my application mentioned above

  • 0
    TI__Guru 58641 points

    Hi Karthik,

    thank you for using the E2E forum.

    It looks like the input check for this design Webench is too tight.

    For a fast workaround just set your lower input voltage to 6V.

    I will forward this issue to the Webench team but it can take some time till a fix is released.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    Prodigy 20 points

    Hi Stefan,

         So we can generate 6V output from 9V to 16V Input by using SEPIC configuration. Is my understanding correct?

        Also like to know whether discrete component used in design will change its value when we are generating 6V output from 9V min. i/p voltage setting in WEBENCH and 6V min. i/p voltage setting based on your recommendation.

  • 0 in reply to karthik j
    TI__Guru 58641 points

    Hi Karthik,

    yes, this is possible.

    you can also use the QuickStart calculator to do the calculations: (Just use the one from the none H version)

    https://www.ti.com/lit/zip/snvr481

    Here you can see which parameter influences the different input ranges (this tool does not have the current limitation of Webench).

    Best regards,

     Stefan

  • +1 in reply to Stefan Schauer
    TI__Guru 65200 points

    Hello Karthik,

    As we did not hear back from you, I expect that your issue is solved and I close this thread. Please post below if you have further question or start a new thread.

    Best regards,
    Brigitte