AN3028 datasheet(20/37 Pages) STMICROELECTRONICS

20 / 37 page

Burst mode and output voltage ripple

AN3028

20/37

Doc ID 16135 Rev 1

In version 2.0 of the ENERGY STAR® program the power consumption of the power supply

when it is not loaded is also considered. The criteria for compliance are given in the table

below:

The performance of the presented board (when the self-supply function is not used) is much

better than required, the power consumption is about ten times lower than the ENERGY

STAR® limit. Even if the performance seems to be disproportionally better than the

requirements, it is worth noting that often the AC-DC adapter or battery charger

manufacturers have very strict requirements about no-load consumption and when the

converter is used as an auxiliary power supply, the line filter is often the main line filter of the

entire power supply that considerably increases standby consumption.

Even if the ENERGY STAR® program does not have other requirements regarding light-load

performance, in order to give complete information we also show the input power and

efficiency of the demonstration board in two other low-load cases. Table 14 and 15 show the

performance when the output load is 25 mW and 50 mW respectively.

Table 13.

Energy consumption criteria for no load

Nameplate output power (Pno)

Maximum power in no load for AC-DC EPS

0 to = 50 watt

< 0.3 watts

> 50 watts < 250 watts

< 0.5 watts

Table 14.

Low-load performance, POUT = 25 mW

VIN_AC

POUT (mW)

PIN (mW)

efficiency (%)

Without

self-supply

With

self-supply

Without

self-supply

With

self-supply

56.00

124

44.64

20.16

115

58.46

149

42.76

16.78

150

62.23

185

40.17

13.51

180

62.77

213

39.83

11.72

230

65.63

262

38.09

9.56

265

67.51

296

37.03

8.44

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