I get Eff = 106.5% I Power 2.82347W O Power 3.00689W. This is simulating 1V @ 3A on Rail 1 of ADP5054.
Is tool working correctly? Patrick
Whenever the efficiency is larger than 1, there is a problem.
In your simulation file, the actual current to the load is Iload + Istep. Istep is negative current step set up for transient analysis.
As the power probe was added to the Rload pin, only the current through Rload is counted. To get the right number, simply delete Istep and rerun the efficiency simulation. see attached.
However, the efficiency simulation in the file won’t be as accurate as the estimation in the excel design tool ( would be higher) , as the inductor core loss is not modeled in the simulation model, plus the switching loss which is related to the parasitic of the MOSFET is not accurately modeled. For efficiency estimation, please refer to the losses section ( Channel 1 to 4) in the design tool.
Yes, I see. Actually ADIsimPE 8.00 fixed the problem. How / where can I add inductor core loss in spreadsheet?
The inductor core loss calculation is done automatically if you choose an inductor that is in out database and is selected by our design tool. You could find the power losses in the performance estimation:
It is not applicable for the user to add an inductor which is not in our database or not selected by out design tool. However, you could try to check it on the manufacture's website for the losses calculation given the switching frequency and inductor current, for instance Coilcraft Power Inductor Comparison Tool
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