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AN3011 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN3011
Description  In certain applications such as LCD or plasma TVs
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3011 Datasheet(HTML) 22 Page - STMicroelectronics

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Efficiency
AN3011
22/37
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)
90
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)
PIN
(mW)
POUT
(mW)
Efficiency
(%)
Pin-Pout
(mW)
90
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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