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AN2950 Datasheet(PDF) 34 Page - STMicroelectronics

Part # AN2950
Description  This document describes
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2950 Datasheet(HTML) 34 Page - STMicroelectronics

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Test equipment and measurement of efficiency and low load performance
AN2950
34/37
Doc ID 15494 Rev 1
If the power level does not drift by more than 5% from the maximum value observed, the
UUT can be considered stable and the measurements can be recorded at the end of the
5-minute period.
If the AC input power is not stable over a 5-minute period, the average power or
accumulated energy should be measured over time for both the AC input and DC output.
Some wattmeter models allow integrating the measured input power in a time range and
then measuring the energy absorbed by the UUT during the integration time. The average
input power is calculated by dividing the measured energy by the integration time itself.



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