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TPS82740 how to measure the efficiency at light load

Dear TI

Customer is evaluating efficiency at light load.

Condition is following

After calculation, Ivin will be around 6uA. So input an equipment as series with 600uA range to maesure Ivin.

But in this case, IC can't operate due to limit 600uA range for peak current.

When it's used 300mA range of equipment, IC can operate.But accuracy is too low for 6uA Ivin at light load.

Could you give me any idear to measure Ivin at light load or how to measure efficiency at light load?

These DMM equipmet are

      600uA range :FLUKE116

     300mA range :FLUKE73-3

Thank you and best Regards

K.Narisawa