Datasheet
AN3172 Efficiency measurement
Doc ID 17230 Rev 1 11/31
2 Efficiency measurement
EPA rev. 2.0 external power supply compliance verification.
Table 1 shows the no-load consumption and the overall efficiency, measured at the nominal
mains voltages. At 115 Vac the average efficiency is 89.96 %, while at 230 Vac it is 91.12 %.
Both values are much higher than the minimum required by EPA rev2.0 External power
supply limits (87 %).
Measurements are also given in Figure 3 for reference.
Even at no-load the board performance is superior; maximum no-load consumption at
nominal mains voltage is less than 250 mW only; even this value is significantly lower than
the 500 mW limit imposed by the ENERGY STAR program.
Figure 3. Efficiency vs. output power diagram
Table 1. Overall efficiency
Test 230 V-50 Hz 115 V-60 Hz
Vout
[V]
Iout
[A]
Pout
[W]
Pin
[W]
Eff.
[%]
Vout
[V]
Iout
[A]
Pout
[W]
Pin
[W]
Eff.
[%]
No load 18.98 0.00 0.00 0.246 ------ 18.97 0.00 0.00 0.235 ------
100 % load eff. 18.93 4.700 88.97 96.15 92.53 % 18.93 4.700 88.97 98.04 90.75 %
75 % load eff. 18.94 3.526 66.78 72.29 92.38 % 18.94 3.526 66.78 73.40 90.98 %
50 % load eff. 18.95 2.352 44.57 48.72 91.48 % 18.95 2.352 44.57 49.14 90.70 %
25 % load eff. 18.96 1.177 22.32 25.33 88.10 % 18.96 1.177 22.32 25.53 87.41 %
Average eff. 91.12 % 89.96 %
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