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Measure efficiency of ultra low-IQ devices

Posted: 11 Nov 2014 ?? ?Print Version ?Bookmark and Share

Keywords:power supply? ultra low quiescent current? light-load? efficiency? measurements?

While almost every power supply engineer intimately knows and understands the lab setup for measuring efficiency, there are many important nuances that must be considered when measuring the efficiency of a device with ultra low quiescent current (IQ). For a device that consumes less than 1?A, the circuit's currents are very small and difficult to measure. These measurements may equate to calculated light-load efficiencies that are far lower than what is shown in the datasheet graphs and lower than what would be seen in the real application. This article reviews the basics of measuring efficiency, discusses common mistakes in measuring the light-load efficiency of ultra low-IQ devices, and demonstrates how to overcome them in order to get accurate efficiency measurements.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Accurately measuring efficiency of ultra low-IQ devices".

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