Datasheet

Efficiency measurement AN3329
10/47 Doc ID 18376 Rev 1
The average efficiency has been calculated according to ENERGY STAR 2.0 criteria.
Results are summarized in Figure 3 and 4.
Standby supply efficiency
Standby supply efficiency has been measured and the results are plotted in Figure 5. As
shown, the efficiency during rated load operation is above 82 %, over the whole input mains
voltage range, from 50 % to full load.
Efficiency during standby operation at very light load, like microprocessor and wake-up
circuitry, is plotted in Figure 6. As shown, in this condition it is higher than 35 % at 230 Vac,
therefore, it allows to supply the microprocessor with a significant low consumption from the
mains. It should be mentioned that the standby supply efficiency has been calculated
measuring the input power at the input connector, including power loss contribution due to
all residual loads connected to mains before and after the input bridge rectifier, like the EMI
filter and PFC resistor dividers.
Figure 3. Overall efficiency vs. output power Figure 4. Average efficiency acc. ES-2
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Figure 5. Standby supply efficiency vs.
output power
Figure 6. Standby supply efficiency vs. light
load output power
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