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LM5008: Efficiency problem

user6241108
Prodigy 10 points
Part Number: LM5008

Dear  All

       I had find there is two efficiency on the LM5008 by different inductance, as below:

       1. When the inductance is 320uH,the efficiency is 35%

       2. When the inductance is 330uH,the efficiency is 60%.

       Why ?  The output is 15mA.

  • 0
    TI__Guru 71935 points

    With such a small change in inductor value I would not expect a big change in efficiency.

    I may be that your inductors have different core loss.  I would measure the switching frequency and peak current 

    and see if there is a big difference there.