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LM25118: Low output efficiency

Timsen
Expert 1660 points
Part Number: LM25118

Dear all:

      The output of LM25118 is 5V, and the input is also about 5V (PC supplies 5V). The efficiency, I measurement the input voltage, input current, output voltage and output current are measured to calculate efficiency the test results  are as follows:

(5.035V*0.496A)/(4.985V*0.673A)=74.4%

is only about 70%.But I think the Data sheet is pretty efficient.

Please help to analyze the possible reasons for the inefficiency.How to improve output efficiency?

  • 0
    TI__Guru 58881 points

    Hi
    The responsible engineer is out now. He will reply by 06/24.
    Basically, the efficiency of your system is low because you measured at 2.5W while the efficiency in the datasheet is measured at 12 - 36Watt .
    Regards,
    EL

  • 0 in reply to EricLee
    TI__Guru* 78340 points

    Hi,

    Sorry for the delay.  I just came back from the biz trip. 

    Like Eric mentioned, your design may not be optimized for your power level, if 2.5W is your max power.  Please refer to the design calculator tool at the following link to re-select the components.  

    Best Regards,

    Youhao Xi, Applications Engineering