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LM76005QEVM: Efficiency data differences between EVM users guide and WeBench

Kazuhiko Hirano
Genius 15488 points
Part Number: LM76005QEVM
Other Parts Discussed in Thread: LM76005

Hello,

My customer would like to hear TI expert comments or opinion about efficiency data differences between EVM users guide and WeBench.

LM76005QEVM User’s Guide Figure 6.2 shows LM7600QEVM efficiency plots as follows.
My customer try to mimic LM7600QEVM circuits using WeBench (please refer to the attached .pdf file) with the conditions, Vin=36V, Vout=3.3V and Iout=A. Its efficiency is as follows, looks a bit better than the plots for Vin=36V in Figure 6.2.

Q1:
Any suggestions about components parameters of the WeBench to make the simulation results match Figure 6.2?

Q2
Or WeBench simulation results tend to show this degree of better efficiency results than actual typical LM76005 device efficiency?

Q3
Or WeBench simulation results show LM7600 typical efficiency, but the sample used to take Figure 6.2 plots had incidentally a bit worse efficiency than typical efficiency?
WBDesign_Report.pdf

Best regards,

K.Hirano

  • 0
    TI__Guru 50120 points

    Hi Hirano,

    The WEBENCH simulation is again just a simulation which is based on equations and calculations.

    The Figure 6.2 efficiency curve in the User's Guide is the actual results tested on an EVM.

    As such I would suggest using the Figure 6.2 efficiency curve for customer evaluation.

    Additionally it may be preferable to have the customer evaluate on the EVM to their desired application to get a better understanding of the device's performance.

    Regards,

    Jimmy