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LM5009A at 5V output (90v input) and 2mA of load current the Inductor gets HUGE (equation # 7)....8mH. Is this correct?

grant juel
Prodigy 10 points
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LM5009A   at 5V output (90v input) and 2mA of load current the Inductor gets HUGE (equation # 7)....8mH.   Is this correct?

  • 0
    TI__Genius 11490 points
    Hi Grant,

    The tool calculates based on 30-40% of load current. This rule of thumb of course does not work at very low load current. That is why the excel based tool allows you to select an inductor after giving you the value based on the equation.

    For your case you should be able to use much smaller values.