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AN2744 Datasheet(PDF) 45 Page - STMicroelectronics

Part # AN2744
Description  ST7538Q power line FSK transceiver
PDF  56 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2744 Datasheet(HTML) 45 Page - STMicroelectronics

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AN2744
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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
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
10
10.1
10.2
10.3
10.4
10.5
0
100
200
300
400
500
600
I
OUT [mA]
185 V ac
230 V ac
265 V ac
8.9
9
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
10
10.1
10.2
10.3
10.4
10.5
0
100
200
300
400
500
600
I
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
50
100
150
200
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300
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600
I
OUT [mA]
η
0.57
0.59
0.61
0.63
0.65
0.67
0.69
0.71
0.73
50
100
150
200
250
300
350
400
450
500
550
600
I
OUT [mA]
η



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