AN2950 datasheet(14/37 Pages) STMICROELECTRONICS

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Testing the board

AN2950

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Table 7 shows the measured value of the burst mode frequency ripple measured in different

operating conditions. The ripple in burst mode operation is very low and always below

25 mV.

2.4

Efficiency

This and the following section report the results of efficiency and light load measurements.

Appendix A at the end of this document provides some details on the settings of the power

measurement equipment.

According to the ENERGY STAR

average active mode efficiency testing method, the

efficiency measurements have been done at full load and at 75%, 50% and 25% of full load

for different input voltages. The results are reported in Table 8.

Figure 17.

Output voltage ripple at 115 VIN_AC

50 mA

Figure 18.

Output voltage ripple at 230VIN_AC

50 mA

Table 7.

Burst mode related output voltage ripple

VIN

No load (mV)

25 mA load (mV)

50 mA load (mV)

90514

15.4

115

5.6

18.2

20.2

230

19.2

265

6.5

20.2

Table 8.

Efficiency

VIN_AC (VRMS)

Efficiency (%)

Full load

(2 A)

75% load

(1.5 A)

50% load

(1 A)

25% load

(0.5 A)

79.06

79.93

79.41

83.72

115

80.61

81.12

83.45

83.78

150

81.53

81.85

81.73

85.03

180

81.90

81.58

80.46

80.38

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