AN2744 datasheet(45/56 Pages) STMICROELECTRONICS

45 / 56 page

AN2744

Board description

45/56

Figure 44

shows the efficiency vs. output current curve. Minimum efficiency occurs at low

load condition, as expected from any SMPS. This is not an issue for our application, since

low efficiency corresponds also to low power consumption and thus to low dissipation.

On the other hand, at full load condition the efficiency is reduced because of the losses due

to R1 (series input resistor limiting in-rush current) and to the filtering on both primary and

secondary side. Filtering is more important than efficiency because a power line

communication appliance has very restrictive electromagnetic disturbance limits and it's

also highly sensitive to noise coming from the power supply.

Figure 44.

Load regulation

8.9

9.1

9.2

9.3

9.4

9.5

9.6

9.7

9.8

9.9

10.1

10.2

10.3

10.4

10.5

100

200

300

400

500

600

OUT [mA]

185 V ac

230 V ac

265 V ac

8.9

9.1

9.2

9.3

9.4

9.5

9.6

9.7

9.8

9.9

10.1

10.2

10.3

10.4

10.5

100

200

300

400

500

600

OUT [mA]

185 V ac

230 V ac

265 V ac

Figure 45.

SMPS efficiency curve

0.57

0.59

0.61

0.63

0.65

0.67

0.69

0.71

0.73

100

150

200

250

300

350

400

450

500

550

600

OUT [mA]

0.57

0.59

0.61

0.63

0.65

0.67

0.69

0.71

0.73

100

150

200

250

300

350

400

450

500

550

600

OUT [mA]

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