Datasheet

Efficiency measurement AN3172
12/31 Doc ID 17230 Rev 1
2.1 Light-load operation efficiency
Measurement results are given in Table 2 and plotted in Figure 4. As seen, efficiency is
better than 55 % even for very light loads such as 500mW.
Figure 4. Light-load efficiency diagram
Table 2. Light-load efficiency
Test 230 V - 50 Hz 115 V - 60 Hz
Vout
[V]
Iout
[mA]
Pout
[W]
Pin
[W]
Eff.
[%]
Vout
[V]
Iout
[mA]
Pout
[W]
Pin
[W]
Eff.
[%]
0.25 W 18.89 13.06 0.247 0.643 38.37 % 18.89 13.06 0.247 0.62 39.60 %
0.5 W 18.89 26.83 0.507 0.911 55.63 % 18.89 26.83 0.507 0.869 58.32 %
1.0 W 18.89 51.92 0.981 1.415 69.31 % 18.89 51.93 0.981 1.404 69.87 %
1.5 W 18.89 78.90 1.490 2.014 74.00 % 18.89 78.90 1.490 2.010 74.15 %
2.0 W 18.89 105.9 2.000 2.608 76.67 % 18.89 105.9 2.000 2.610 76.61 %
2.5 W 18.89 130.2 2.459 3.145 78.17 % 18.89 130.2 2.459 3.152 78.01 %
3.0W 18.89 157.2 2.970 3.748 79.23 % 18.89 157.2 2.970 3.762 78.93 %
3.5 W 18.89 184.2 3.480 4.337 80.23 % 18.88 184.2 3.478 4.358 79.80 %
4.0 W 18.88 211.2 3.987 4.919 81.04 % 18.88 211.2 3.987 4.936 80.76 %
4.5 W 18.88 235.4 4.445 5.415 82.08 % 18.88 235.4 4.445 5.453 81.51 %
5.0 W 18.88 262.4 4.954 5.983 82.81 % 18.88 262.4 4.954 6.031 82.14 %
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