AN3233 datasheet(11/35 Pages) STMICROELECTRONICS

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AN3233

Efficiency measurement

Doc ID 17595 Rev 1

11/35

Efficiency measurement

EPA rev. 2.0 external power supply compliance verification

Table 1

shows the no-load consumption and the overall efficiency, measured at the nominal

mains voltages. At 115 Vac the average efficiency is 90.6 %, while at 230 Vac it is 91.8 %.

Both values are much higher than the 87 % required by EPA rev 2.0 external power supply

(EPS) limits.

The efficiency at nominal load, 230 Vac, is 94 %, which is a very high efficiency for a double

stage converter and confirms the benefit of implemented SR.

Also at no load the board performances are superior: maximum no-load consumption at

nominal mains voltage is 200 mW; this value is significantly lower than the limit imposed by

the ENERGY STAR program which is 500 mW.

Table 1.

Overall efficiency

Test

230 V - 50 Hz

115 V - 60 Hz

Vout

[V]

Iout

[A]

Pout

[W]

Eff.

[%]

Vout

[V]

Iout

[A]

Pout

[W]

Eff.

[%]

No load

12.10

0.00

0.20

----------- 12.10

0.00

0.20

-----------

25 % load eff.

12.14

3.10

37.63

43.15

87.2 %

12.13

3.10

37.60

43.08

87.3 %

50 % load eff.

12.14

6.19

75.15

81.30

92.4 %

12.12

6.19

75.02

82.34

91.1 %

75 % load eff.

12.08

9.37

113.19 120.81

93.7 %

12.07

9.38

113.22 123.00

92.0 %

100 % load eff. 12.04 12.47 150.14 159.79

94.0 %

12.04 12.50 150.50 163.90

91.8 %

Average eff.

91.8 %

90.6 %

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