AN3106 datasheet(9/34 Pages) STMICROELECTRONICS

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AN3106

Efficiency measurement

Doc ID 16775 Rev 2

9/34

Efficiency measurement

Table 1 shows the overall efficiency, measured at 230 V - 50 Hz and 115 V - 60 Hz input

voltage and different loads.

At 115 VAC and full load the overall efficiency is 90.96%. It increases up to 93.38%

at 230 VAC, confirming that this reference design is suitable for high-efficiency power

supplies. The efficiency has been measured at 25%, 50%, 75% and 100%, and the average

efficiency according to the ES-2 standard has been calculated. As shown in Table 1 it is very

high at both nominal mains.

The measured output voltage at different load conditions is also shown in Table 1. As visible,

the voltage is very stable over the entire output load range.

The measured efficiency is shown in Figure 3, while Figure 4 shows the efficiency at

maximum load over the entire AC input voltage mains range.

Table 1.

EVL130W-STRLIG demonstration board: overall efficiency vs. load

Load

230 V - 50 Hz

115 V - 60 Hz

VOUT [V] IOUT [A] POUT [W] PIN [W]

Eff. [%] VOUT [V] IOUT [A] POUT [W] PIN [W] Eff. [%]

25% load

47.58

0.689

32.8

37.87

86.57%

47.59

0.689

32.8

37.87

86.58%

50% load

47.57

1.378

65.6

71.66

91.48%

47.58

1.378

65.6

72.93

89.90%

75% load

47.56

2.008

95.5

102.96

92.75%

47.56

2.001

95.2

105.0

90.64%

100% load

47.55

2.708

128.8

137.6

93.38%

47.56

2.703

128.6

141.33

90.96%

Average

efficiency

91.04%

89.52%

Figure 3.

EVL130W-STRLIG demonstration

board: efficiency vs. load

Figure 4.

EVL130W-STRLIG demonstration

board: full-load efficiency vs. VAC

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