VIPER115LSTR datasheet(31/37 Pages) STMICROELECTRONICS

31 / 37 page

DS11873 Rev 5

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VIPer11

Application information

6.2

Energy saving performance

The device allows designing applications to be compliant with the most stringent energy

saving regulations. In order to show the typical performance is achievable, the active mode

average efficiency and the efficiency at 10% of the rated output power of a 5 V/1.6 A non-

isolated flyback and 5 V/360 mA buck converters adopting VIPer11, have been measured

and are reported in Table 9. In addition, no-load and light load consumptions are shown

from Figure 41 to Figure 44.

Table 9. Power supply efficiency, VOUT = 5 V

Parameter

VIN

10 % output load

efficiency [%]

Active mode average

efficiency [%]

Pin at no-load [mW]

Flyback non iso. 5 V/1.6 A

115 VAC

78.3

78.5

3.9

230 VAC

71.4

79.4

8.2

Buck 5 V/360 mA(1)

115 VAC

73.9

71.6

12.1

230 VAC

69.1

69.8

16.2

1. 5 mW bleeder connected at the output.

Figure 41. PIN versus VIN in no-load non

isolated flyback converter (5 V/1.6 A)

Figure 42. PIN versus VIN in light load non

isolated flyback converter (5 V/1.6 A)

Figure 43. PIN versus VIN in no-load non

isolated buck converter (5 V/360 mA)

Figure 44. PIN versus VIN in light load non

isolated buck converter (5 V/360 mA)

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