AN3203 datasheet(20/49 Pages) STMICROELECTRONICS

20 / 49 page

Electrical performance

AN3203

20/49

Doc ID 17402 Rev 2

Note:

This table refers to power supplies for redundant, data center applications with 230Vac

mains

This demonstration board is compliant with the 80 PLUS® Silver specifications (for PF data

please refer to Table 9). Since this is basically a desktop PC power supply, the tests were

performed at 115 Vac. Certification report and other details can be found on the 80 PLUS®

web site.

Similar levels of efficiency and power factor are defined also by the Climate Savers

Computing Initiative. According to the measurements carried out, the demonstration board

is compliant with “Climate Savers Computing Silver” level.

Table 6 shows the no-load consumption. These values are taken with the signal PS_ON

kept low, therefore only the auxiliary stage is active and only the +5 V_SB output is present.

The board showed very good values (below 200 mW over the whole input voltage range),

especially when considering that the inactive stages have a certain residual consumption

(only the voltage dividers in the input stage waste about 100 mW @ 230 Vac).

Figure 14 and Figure 15 show the graph of the efficiency vs. output power at the two

nominal input voltages while Figure 16 shows the graph of the input power vs. input voltage

with no load applied. It is clearly visible that the power supply is compliant with the 80

PLUS® SILVER specification and it is very close to the GOLD one.

Table 4.

80 PLUS® program efficiency levels (230 Vac)

Level

Eff @ 20%

Eff @ 50%

Eff @ 100%

PF (@ load%)

80 PLUS Bronze

> 81%

> 85%

> 81%

> 0.9 @ 50%

80 PLUS Silver

> 85%

> 89%

> 85%

> 0.9 @ 50%

80 PLUS Gold

> 88%

> 92%

> 88%

> 0.9 @ 50%

80 PLUS Platinum

> 90%

> 94%

> 91%

> 0.95 @ 50%

Table 5.

Climate Savers Computing Initiative (for multi-output PSU)

Load

condition

Bronze

Silver

Gold

Efficiency

20 %

82 %

0.8

85 %

0.8

87 %

0.8

50 %

85 %

0.9

88 %

0.9

90 %

0.9

100 %

82 %

0.95

85 %

0.95

87 %

0.95

Table 6.

No-load consumption

Vin [Vac]

115

135

180

230

264

Pin [mW]

113

161

199

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