AN3028 datasheet(21/37 Pages) STMICROELECTRONICS

21 / 37 page

AN3028

Burst mode and output voltage ripple

Doc ID 16135 Rev 1

21/37

The input power vs. input voltage for no-load and low-load condition (Table 12, 14 and 15)

are shown in the figures below.

Depending on the equipment supplied, we can have several criteria to measure the standby

or light-load performance of a converter. One criterion is the measure of the output power

when the input power is equal to one watt. In Table 16 the output power needed to have 1 W

of input power in different line conditions is given. Figure 24 shows the output power

corresponding to PIN = 1 W for different values of the input voltage.

Table 15.

Low-load performance, POUT = 50 mW

VIN_AC

POUT (mW)

PIN (mW)

efficiency (%)

Without

self-supply

With

self-supply

Without

self-supply

With

self-supply

161

54.55

31.09

115

187

52.98

26.74

150

100

224

50.00

22.30

180

100

252

50.00

19.84

230

102

300

48.88

16.67

265

105

335

47.62

14.95

Figure 23.

PIN vs. VIN at POUT = 0; 25 mW; 50 mW

a) without self-supply (J2 selected)

b) with self-supply (J and J2 not selected)

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