AN3286 datasheet(21/42 Pages) STMICROELECTRONICS

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AN3286

Testing the board

Doc ID 17998 Rev 1

21/42

The criteria are plotted in Figure 22, where the red line depicts the criteria for the standard

model and the blue line the criteria for the low voltage model. The PNO axis uses

a logarithmic scale.

Figure 22.

ENERGY STAR efficiency criteria

The presented power supply belongs to the low-voltage power supply category and, in order

to be compliant with ENERGY STAR requirements, needs to have an efficiency higher than

73.37%. For all the considered input voltages, the efficiency results (see Table 8) are higher

than the recommended value.

2.5

Light load performances

The input power of the converter was measured in no load conditions for different input

voltages. The results are given in Table 13.

Version 2.0 of the ENERGY STAR program also takes into consideration the power

consumption of the power supply when it is not loaded. The criteria to be compliant with are

reported in Table 14.

Table 13.

No load input power

VIN (VAC)

PIN (mW)

115

150

180

230

265

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