AN2929 datasheet(13/32 Pages) STMICROELECTRONICS

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AN2929

Testing the board

Doc ID 15333 Rev 2

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Table 6 shows the measured value of the burst mode related ripple measured in different

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

below 25 mV.

2.3

Efficiency

The efficiency of the converter was measured in different load and line voltage conditions.

According to the ENERGY STAR® average active mode testing efficiency method, the

measurements were done with full load and with 75%, 50%, and 25% of the full load for

different input voltages, seeTable 7.

The results were plotted in the following figures for better visibility. Figure 13 shows the

efficiency versus VIN for the four different load values and Figure 14 shows the efficiency

versus load for different input voltages.

Table 6.

Burst mode related output voltage ripple

VIN

No load (mV)

25 mA load (mV)

50 mA load (mV)

5.1

13.5

14.5

115

5.2

14.5

15.5

230

5.4

15.4

16.9

265

5.7

15.8

Table 7.

Efficiency

VINAC

(VRMS)

Efficiency (%)

Full load

(2.4 A)

75% load

(1.8 A)

50% load

(1.2 A)

25% load

(0.6 A)

72.46

75.34

78.503

79.841

115

74.96

76.95

79.634

80.395

230

77.70

79.04

80.690

79.990

265

77.80

78.97

80.264

78.287

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