Test results

AN2521

8/33

2

Test results

2.1

Efficiency measurements at full load, tracking boost option

(TBO)

The following table and diagrams show the single converter and overall efficiency measured

at different input voltages. These measurements are performed with nominal load (4 A).

Figure 3.

EVAL6668-75W global efficiency measurements at full load

In Table 2 the ENERGY STAR efficiency measurements are shown. The average of the two

mains voltage inputs in four different load conditions is compliant with the target requirement

(better than 84%).

Table 1.

Efficiency measurements at full load using the TBO function

Efficiency

PFC

dc-dc

Global

90 [V]

93.63%

89.83%

84.11%

115 [V]

95.62%

89.07%

1.

Compliant to CEC, EU-COC, regulation. In Table 1 and Figure 3 the single converter efficiency

measurement is shown. Thanks to the very good efficiency of any single block the overall efficiency is very

high too, especially if we compare this data with similar converters using a double stage and a flyback

topology as downstream converter.

230 [V]

97.84%

89.81%

265 [V]

97.53%

89.06%

86.86%

Table 2.

ENERGY STAR compliance

ENERGY STAR efficiency

1 A

2 A

3 A

4 A

Average

115 [V]

85.26%

86.32%

86.28%

85.17%

85.75%

230 [V]

83.4%

85.2%

86.74%

87.87%

85.8%

80%

81%

82%

83%

84%

85%

86%

87%

88%

89%

90%

90

115

230

265

Vin [Vrms]

WITH TBO