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AN4165 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN4165
Description  This document describes a 12 V - 1 A power supply set in non-isolated flyback topology
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4165 Datasheet(HTML) 19 Page - STMicroelectronics

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AN4165
Light-load performance
Doc ID 023661 Rev 1
19/37
The input power vs. input voltage for no load and light load condition (
Table 7, 9 and 10) are
shown in the figure below.
Figure 21.
PIN vs. VIN at no load and light load
It’s possible to have several criteria to measure the standby or light load performance of a
converter. One criterion is the measurement of the output power when the input power is
equal to one watt. In
Table 11 the output power needed to have 1 W of input power in
different line conditions is given.
Figure 22 shows the output power corresponding to PIN = 1
W for different values of the input voltage.
Table 10.
Light load performance at POUT = 50 mW
VIN [VAC]POUT [mW]
PIN [mW]
Efficiency (%)
90
50
76.7
65.2
115
50
78.5
63.7
150
50
82.0
61.0
180
50
85.0
58.8
230
50
90.0
55.6
265
50
94.0
53.2
Table 11.
POUT @ PIN = 1 W
VIN [VAC]PIN (W)
POUT (W)
Efficiency (%)
90
1
0.788
78.8
115
1
0.781
78.1
150
1
0.76
76.0
180
1
0.74
74.0
230
1
0.70
70.0
265
1
0.686
68.6
AM11570v1
0
25
50
75
100
125
150
175
200
80105
130155
180205
230255
VIN [VAC]
0
25mW
50mW



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