AN4026 datasheet(12/40 Pages) STMICROELECTRONICS

12 / 40 page

Efficiency measurements

AN4026

12/40

Doc ID 022603 Rev 1

Efficiency measurements

Table 1 shows the no load consumption and the overall efficiency, measured at the nominal

mains voltages. At 115 Vac the average efficiency is 89.8%, while at 230 Vac it is 91.5%.

Both values are significantly higher than the minimum required by EPA rev2.0 external

power supply limits (87%).

Measurements are also reported 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 200 mW; also this value is significantly lower than the

limit imposed by the ENERGY STAR program, which is 500 mW, and it can meet more

stringent requirements.

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]

Eff.

[%]

Vout

[V]

Iout

[A]

Pout

[W]

Eff.

[%]

100% load eff. 18.75

4.74

88.88

96.70

91.9%

18.75

4.74

88.88

98.90

89.9%

75% load eff.

18.76

3.60

67.54

73.38

92.0%

18.76

3.60

67.54

74.82

90.3%

50% load eff.

18.77

2.40

45.05

49.32 91.34% 18.77

2.40

45.05

49.95

90.2%

25% load eff.

18.79

1.20

22.55

24.86 90.70% 18.78

1.20

22.54

25.39

88.8%

No load

18.98

0.00

0.186

18.78

0.162

Average eff.

91.5%

89.8%

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