AN3203 datasheet(19/49 Pages) STMICROELECTRONICS

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AN3203

Electrical performance

Doc ID 17402 Rev 2

19/49

Electrical performance

4.1

Efficiency measurement and no-load consumption

The efficiency measurements taken at the two nominal voltages are seen in the following

tables. The +5 V_SB output was unloaded during these measurements.

The 80 PLUS® program fixes several efficiency levels that describe how energy-efficient a

computer power supply is. The program defines the minimum efficiency requirements at 20

%, 50 %, 100 % of rated load and a minimum power factor requirement.

According to the program a power supply could be classified in 4 or 5 levels:

Note:

This table refers to power supplies for desktops, workstations, and non-redundant server

applications with 115 Vac mains

Table 1.

Efficiency @ 115 Vrms

Load

+12 V @load[A]

+5 V @load[A]

+3.3 V @load[A]

Pout [W]

Pin [W]

Eff [%]

20 %

12.13

2.702

5.02

2.409

3.33

1.6

50.196

58.5

85.81 %

25 %

12.13

3.374

5.019

3.008

3.329

2.004

62.695

71.97

87.11 %

50 %

12.13

6.749

5.012

6.007

3.325

3.999

125.27

140.22

89.34 %

75 %

12.13

10.122

5.003

9.006

3.318

6.008

187.77

211.19

88.91 %

100 %

12.12

13.5

4.996

12.003

3.313

8.001

250.09

285.41

87.63 %

Table 2.

Efficiency @ 230 Vrms

Load

+12 V @load[A]

+5 V @load[A]

+3.3 V @load[A]

Pout [W]

Pin [W]

Eff [%]

20 %

12.14

2.701

5.019

2.408

3.329

1.599

50.199

58.62

85.63 %

25 %

12.14

3.374

5.018

3.008

3.328

2.003

62.720

71.52

87.70 %

50 %

12.13

6.754

5.011

6.006

3.323

3.998

125.31

138.07

90.76 %

75 %

12.12

10.122

5.004

9.006

3.318

6.008

187.68

207.49

90.45 %

100 %

12.12

13.5

4.997

12.002

3.313

8.001

250.10

279.66

89.43 %

Table 3.

80 PLUS® program efficiency levels (115Vac)

Level

Eff @ 20 %

Eff @ 50 %

Eff @ 100 %

PF (@ load %)

80 PLUS

> 80 %

> 0.9 @ 100 %

80 PLUS Bronze

> 82 %

> 85 %

> 82 %

> 0.9 @ 50 %

80 PLUS Silver

> 85 %

> 88 %

> 85 %

> 0.9 @ 50 %

80 PLUS Gold

> 87 %

> 90 %

> 87 %

> 0.9 @ 50 %

80 PLUS Platinum

> 90 %

> 92 %

> 89 %

> 0.95 @ 50 %

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