AN3286 datasheet(17/42 Pages) STMICROELECTRONICS

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AN3286

Testing the board

Doc ID 17998 Rev 1

17/42

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

50 mV.

2.4

Efficiency

This section 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.

For better visibility, the results have also been plotted in the diagrams below. Figure 18 plots

the efficiency vs. VIN for the four different load values. Figure 19 reports the efficiency as

a function of the load for different input voltage values.

Table 7.

Burst mode related output voltage ripple

VIN (VAC)

No load (mV)

25 mA load (mV)

50 mA load (mV)

115

230

265

Table 8.

Efficiency

VIN (VAC)

Efficiency (%)

Full load (2 A)

75% load (1.5 A)

50% load (1 A)

25% load (0.5 A)

78.00

80.60

81.33

82.83

115

80.42

82.40

82.37

82.83

150

81.95

83.16

82.46

82.34

180

82.49

83.33

82.15

81.62

230

82.63

83.00

81.17

80.33

265

82.25

82.29

80.00

79.28

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