AN3014 datasheet(11/29 Pages) STMICROELECTRONICS

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AN3014

Efficiency measurement

Doc ID 16064 Rev 2

11/29

Light load operation efficiency

Measurement results are reported in Table 3 below and plotted in Figure 3. As shown,

efficiency is better than 68% even for very light loads, such as 1 W.

Figure 3.

Light load efficiency diagram

Table 3.

Light load efficiency

Test

230 V - 50 Hz

115 V - 60 Hz

Vout

[V]

Iout

[mA]

Pout

[W]

Eff.

[%]

Vout

[V]

Iout

[mA]

Pout

[W]

Eff.

[%]

0.25 W

18.97

13.2

0.250

0.610

41.05%

18.97

13.2

0.250

0.590

42.45%

0.5 W

18.97

26.4

0.501

0.877

57.18%

18.97

26.4

0.501

0.870

57.57%

1.0 W

18.97

52.7

0.999

1.467

68.13%

18.97

52.7

0.999

1.457

68.60%

1.5 W

18.98

79.0

1.499

2.160

69.41%

18.97

79.2

1.503

2.134

70.41%

2.0 W

18.97

105.5

2.002

2.822

70.93%

18.97

105.5

2.002

2.895

69.15%

2.5 W

18.97

131.8

2.500

3.558

70.27%

18.98

131.8

2.501

3.711

67.38%

3.0W

18.98

158.3

3.004

4.110

73.09%

18.97

158.3

3.002

4.230

70.97%

3.5 W

18.97

184.5

3.501

4.660

75.13%

18.97

184.5

3.501

4.637

75.49%

4.0 W

18.97

210.8

3.999

5.256

76.08%

18.97

210.8

3.999

5.234

76.40%

4.5 W

18.97

237.3

4.502

5.840

77.08%

18.97

237.3

4.502

5.830

77.22%

5.0 W

18.97

263.6

5.000

6.450

77.52%

18.97

263.6

5.001

6.420

77.89%

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