AN4027 datasheet(13/41 Pages) STMICROELECTRONICS

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AN4027

Efficiency measurements

Table 2 shows the no load consumption and the overall efficiency measurements at the

nominal mains voltages. At 115 Vac the full load efficiency is 91.5%, and at 230 Vac it is

93.2%, which are both high values for a double stage power supply and confirm the benefit

of implementing the synchronous rectification. The results are also shown in Figure 5 as

a graph.

Also at no load, the board performance is superior for a 150 W power supply: no load

consumption at nominal mains voltage is lower than 160 mW.

Figure 4. Graph of efficiency measurements

Table 2. Efficiency measurements

Input voltage

Load condition

Vout [V]

Iout [A]

Pout [W]

Pin [W]

Efficiency (%)

115 V - 60 Hz

No load

12.00

0.00

0.132

10%

11.99

1.257

15.07

18.04

83.54

20%

11.99

2.50

29.98

35.58

84.2

25%

11.99

3.13

37.53

43.36

86.6

50%

11.97

6.25

74.81

82.53

90.6

75%

11.96

9.38

112.18

122.54

91.5

100%

11.94

12.50

149.25

163.12

91.5

230 V - 50 Hz

No load

12.00

0.00

0.145

10%

11.98

1.258

15.07

17.43

86.46

20%

11.99

2.50

29.98

35.35

84.8

25%

11.98

3.14

37.62

43.27

86.9

50%

11.97

6.25

74.81

81.56

91.7

75%

11.96

9.38

112.18

120.66

93.0

100%

11.94

12.50

149.25

160.22

93.2

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