AN3233 datasheet(12/35 Pages) STMICROELECTRONICS

12 / 35 page

Efficiency measurement

AN3233

12/35

Doc ID 17595 Rev 1

Light load operation efficiency

Measurement results are reported in Table 2 and plotted in Figure 4. As can be seen,

efficiency is better than 50 % even for very light loads such as 500 mW.

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]

Eff.

[%]

Vout

[V]

Iout

[mA]

Pout

[W]

Eff.

[%]

0.25 W

12.12

20.84

0.253

0.581

43.5 %

12.12

20.84

0.253

0.565

44.7 %

0.5 W

12.12

41.34

0.501

0.931

53.8 %

12.12

41.34

0.501

0.912

55.0 %

1.0 W

12.12

82.65

1.002

1.553

64.5 %

12.12

82.65

1.002

1.552

64.5 %

1.5 W

12.12

123.93

1.502

2.203

68.2 %

12.12

123.93

1.502

2.211

67.9 %

2.0 W

12.12

164.93

1.999

2.797

71.5 %

12.12

164.93

1.999

2.828

70.7 %

2.5 W

12.12

206.75

2.506

3.392

73.9 %

12.12

206.75

2.506

3.439

72.9 %

3.0 W

12.11

248.00

3.003

3.979

75.5 %

12.11

248.00

3.003

4.040

74.3 %

3.5 W

12.11

288.25

3.491

4.560

76.6 %

12.11

288.25

3.491

4.644

75.2 %

4.0 W

12.11

330.06

3.997

5.155

77.5 %

12.11

330.06

3.997

5.258

76.0 %

4.5 W

12.11

372.31

4.509

5.748

78.4 %

12.11

372.31

4.509

5.874

76.8 %

5.0 W

12.11

413.34

5.006

6.327

79.1 %

12.11

413.34

5.006

6.474

77.3 %

40%

45%

50%

55%

60%

65%

70%

75%

80%

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

Pout [W]

230V-50Hz

115V-60Hz

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