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LM61460-Q1: Customers have questions about efficiency curves?

Alan Xia
Genius 9650 points
Part Number: LM61460-Q1
Other Parts Discussed in Thread: LM61460

Hi  team，

Which model is the light-load high-efficiency curve of LM61460 tested on?
The customer's test output VOUT=4V, Iout=6.4mA; input Vin=12V, Iin=6.1mA, switching frequency 1.911MHZ, so the efficiency is about 50%?
The model used by the customer is LM61460AASQRJRRQ1

The inductor selection is SUNLORD's AMWSA0603S-4R7MT

Schematic diagram：

  • 0
    TI__Guru 50120 points

    Hello,

    The efficiency curve for the AUTO mode device should have been on the LM61460EVM-AS-400K evaluation kit which is using the LM61460AASQRJRRQ1 IC. 

    How is your efficiency bench connected? In the case where you are measuring efficiency at this light of a load, it is okay to not have the power supply remote sense connected at the input of the EVM as this might draw current and corrupt the input current data. 

    https://www.ti.com/tool/LM61460EVM

    Regards,

    Jimmy