AN3203 datasheet(27/49 Pages) STMICROELECTRONICS

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AN3203

Electrical performance

Doc ID 17402 Rev 2

27/49

4.4

Single output configuration

The power supply overall efficiency is given by the product of the efficiency of each stage. It

is interesting to take a look at the efficiency of the single +12 V output system. Such power

supply can be obtained from the complete system just removing the two daughter boards

that realize the DC-DC post regulation. The single output system can manage the same

power of the multi-output board, hence it is capable of sourcing about 21 A from the +12 V

output.

The system is now made up of input filter, PFC stage, AHB stage and Stand-by stage. The

latter is left unloaded for the following efficiency measurements:

It is interesting to compare the result obtained with the single output configuration with the

80 PLUS® levels (see Table 3 and Table 4). The comparison is graphically shown in

Figure 23 and Figure 24.

Table 10.

Single output efficiency @ 115 Vac

Load [%]

Iout [A]

Vout [V]

Pout [W]

Pin [W]

Eff [%]

10 %

2.085

12.06

25.145

29.79

84.41%

20 %

4.17

12.06

50.290

56.27

89.37%

25 %

5.205

12.06

62.772

69.63

90.15%

50 %

10.421

12.05

125.573

137.4

91.39%

75 %

15.623

12.04

188.101

207.4

90.69%

100 %

20.829

12.03

250.573

279.8

89.55%

Table 11.

Single output efficiency @ 230 Vac

Load [%]

Iout [A]

Vout [V]

Pout [W]

Pin [W]

Eff [%]

10 %

2.084

12.06

25.133

31.02

81.02%

20 %

4.169

12.06

50.278

56.65

88.75%

25 %

5.204

12.06

62.760

69.39

90.45%

50 %

10.421

12.05

125.573

135.3

92.81%

75 %

15.622

12.04

188.089

203.9

92.25%

100 %

20.827

12.03

250.549

274.2

91.37%

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