AN3011 datasheet(22/37 Pages) STMICROELECTRONICS

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Efficiency

AN3011

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Doc ID 16043 Rev 1

Figure 21.

Converter efficiency vs Vin_ac in light-load condition

Depending on the equipment supplied, it’s possible to have several criteria to measure the

standby or light-load performance of a converter. One of these is the measurement of the

output power when the input power is equal to 1 watt. In Table 19 and 20, the output power

needed to have 1 W of input power in different line conditions is shown, with BR disabled

and with BR enabled respectively. Figure 22 shows the diagram of the efficiency

(proportional to the output power) versus the input voltage when the input power is 1 W.

Table 19.

Output power when the input power is 1 W (BR disabled)

VIN (VRMS)PIN (mW)

POUT (mW)

Efficiency (%)

Pin-Pout (mW)

1000

737

73.70

263

115

1000

752

75.23

248

132

1000

757

74.74

243

175

1000

717

71.67

283

230

1000

686

68.62

314

265

1000

666

66.59

334

Table 20.

Output power when the input power is 1 W (BR enabled)

VIN (VRMS)

(mW)

POUT

(mW)

Efficiency

(%)

Pin-Pout

(mW)

1000

737

73.70

263

115

1000

752

75.23

248

132

1000

742

74.21

258

175

1000

712

71.16

288

230

1000

676

67.60

324

265

1000

656

65.57

344

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