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LM25118: I use the LM25118 ,When the Vin=15V ,Vout =12V, I out=2A,the device can not work , i need Iout=3A,please help check how i can make the Iout=3A.Many thanks !

Andrew Liu74
Intellectual 970 points
Part Number: LM25118

I use the LM25118 ,When the Vin=15V ,Vout =12V,  I out=2A,the device can not work , i need Iout=3A,please help check how i can make the Iout=3A.Many thanks !

the  frequency about 100 Khz. 

the sch and bom as attached .LM25118-SCH.pdfLM25118 BOM.xlsxLM25118-SCH.pdf

  • 0
    TI__Guru 53051 points
    TI engineer is working on this request. He will reply as soon as possible.
  • 0
    TI__Mastermind 21720 points

    Hi Andrew,

    Sorry to hear that you are having an issue with your application. Is the converter only having and issue at VIN=15V, VOUT=12V @ 3A? Please provide the input voltage range as well. Is there some other operating point where the converter works? Please provide more detail about the issue that you are observing. Waveforms always help.

    Here are some suggestions:

    1. Reduce the values of XR15 and XR10. These are very large values for the gate resistors

    2. Insure that the inductor is not becoming saturated. I notice that it is only rated for 4.2A.

    Thanks,

    Garrett Roecker