AN3286 datasheet(22/42 Pages) STMICROELECTRONICS

22 / 42 page

Testing the board

AN3286

22/42

Doc ID 17998 Rev 1

The performance of the presented board 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 unproportionally better than required it is worth noting that often

AC-DC adapter or battery charger manufacturers have very strict requirements about no

load consumption, and if the converter is used as an auxiliary power supply, the line filter is

often the big line filter of the entire power supply which significantly increases consumption

in standby mode.

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

performance, in order to provide complete information the input power and efficiency of the

demonstration board, also in two other light load cases, is reported. Table 15 and 16 show

the board performances when the output load is 25 mW and 50 mW respectively.

Table 14.

Energy consumption criteria for no load

Nameplate output power (Pno)

Maximum power in no load for AC-DC EPS

0 to

≤ 50 watts

< 0.3 watts

> 50 watts < 250 watts

< 0.5 watts

Table 15.

Light load performance POUT = 25 mW

VIN (VAC)

POUT (mW)

PIN (mW)

Eff. (%)

PIN - POUT (mW)

54.35

115

52.08

150

49.01

180

47.17

230

41.67

265

37.88

Table 16.

Light load performance. POUT = 50 mW

VIN (VAC)

POUT (mW)

PIN (mW)

Eff. (%)

PIN - POUT (mW)

76.5

65.40

115

64.10

150

61.73

180

58.82

230

54.34

265

51.02

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