AN4027 datasheet(14/41 Pages) STMICROELECTRONICS

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Efficiency measurements

AN4027

14/41

DocID022604 Rev 3

2.1

ENERGY STAR® for external power supplies ver. 2.0

compliance verification

In Table 3 the comparison between the regulation requirements and the test results are

reported: note that the design overcomes the requirements with margin. The average

efficiency is measured at 25 %, 50 %, 75 %, 100 % load, the no load input power

consumption and the power factor at full load meet these regulation requirements for

adapters.

2.2

ENERGY STAR® for computers ver. 6.0 compliance

verification

Because the EVL6699-150W-SR design is suitable to power even all-in-one computers,

having to meet the ENERGY STAR® regulation for computers, the test results have been

compared with the latest ver. 6.0 requirements of this document. In the comparison

between the regulation requirements and the test results are reported: note that, in this case

the efficiency limit is not the average efficiency measured at different loads but there are

three different values of minimum efficiency to be met, at 20 %, 50 %, and 100 % load. Even

in this case, at full load the minimum power factor must be 0.9 minimum. In all load and line

conditions the EVL6699-150W-SR has efficiency and power factor much better than the

minimum required by the ENERGY STAR® regulation.

Table 3. European CoC Tier 2 and ENERGY STAR® ver. 2.0 for external power

supplies compliance verification

European CoC Tier 2 and ENERGY

STAR® ver. 2.0 requirements for external

power supplies

Test results

Limits

Status

115 Vac - 60 Hz 230 Vac - 50 Hz

Average efficiency 25 %, 50 %, 75 %, 100 %

load

0.901

0.912

> 0.87

Pass

Efficiency at 10% load

0.835

0.865

> 0.79

No load input power [W]

0.132 W

0.145 W

< 0.15 W

Power factor

0.991

0.972

> 0.9

Table 4. ENERGY STAR® for computers ver. 6.0 compliance verification

ENERGY STAR® requirements for

computers ver. 6.0:

Test results

Limits

Status

115

Vac - 60 Hz

230

Vac - 50 Hz

Efficiency at 20 % load

0.842

0.848

> 0.82

Pass

Efficiency at 50 % load

0.906

0.917

> 0.85

Efficiency at 100 % load

0.915

0.932

> 0.82

Power factor

0.991

0.972

> 0.9

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