Testing the board

AN2864

20/29

Doc ID 15282 Rev 1

The board performance is much better than required, as the power consumption is

performance seems to be disproportionately better than required, it should be noted that

AC-DC adapter or battery charger manufacturers often have very strict requirements

regarding no load consumption. For example, in the case of converters used as an auxiliary

power supply in LCD TVs, the line filter is often the big line filter of the entire power supply,

which significantly increases standby consumption.

performance, to provide complete information the input power and efficiency of the STEVAL-

ISA058V1 demonstration board in two other low load cases is also reported. Table 14 and

Table 15

display the low load performance when the output load is 25 mW and 50 mW,

respectively.

Table 14.

Low load performance 25 mW of load

Eff. (%)

90

25.0

44.3

56.4

19.3

115

25.0

45.3

55.2

20.3

230

25.0

56.1

44.6

31.3

265

25.0

59.4

42.1

34.4

Table 15.

Low load performance 50 mW of load

Eff. (%)

90

50.00

74.3

67.3

24.3

115

50.00

75.7

66.1

25.7

230

50.00

86.1

58.1

36.1

265

50.00

95.5

52.4

45.5