VIPER37HE datasheet(17/35 Pages) STMICROELECTRONICS

17 / 35 page

VIPER37

Efficiency performances for a typical flyback converter

Doc ID 022218 Rev 1

17/35

Efficiency performances for a typical flyback

converter

The efficiency of the converter has been measured in different load and line voltage

conditions. In accordance with the ENERGY STAR® average active mode testing efficiency

method, the efficiency measurements have been performed at 25%, 50% and 75% and

100% of the rated output power, at both 115 VAC and 230 VAC.

Figure 22.

Power supply consumption at light output loads, VOUT=5 V

Table 9.

Power supply efficiency, VOUT = 5 V, VIN = 115 VAC

%Load

Iout

Vout

Pout

Efficiency

25%

0.75

5.04

3.78

4.83

78.26%

50%

1.5

5.04

7.56

9.72

77.78%

75%

2.25

5.04

11.34

14.84

76.42%

100%

5.04

15.12

20.04

75.45%

Average efficiency

76.97%

Table 10.

Power supply efficiency, VOUT= 5 V, VIN = 230 VAC

%Load

Iout

Vout

Pout

Efficiency

25%

0.75

5.04

3.78

5.01

75.45%

50%

1.5

5.04

7.56

9.76

77.46%

75%

2.25

5.04

11.34

14.67

77.30%

100%

5.03

15.09

19.59

77.03%

Average efficiency

76.81%

100

150

200

250

300

100

150

200

250

300

350

200mW

100mW

50mW

30mW

Input voltage [Vac]

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