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AN4164 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN4164
Description  This document describes a 12 V-350 mA power supply set in non-isolated flyback topology
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4164 Datasheet(HTML) 17 Page - STMicroelectronics

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AN4164
Testing the board
Doc ID 023660 Rev 1
17/38
The input power vs. input voltage for no load and light load condition (
Table 6, 8 and 9) is
shown in the figures below.
Table 8.
Light load performance POUT=25 mW
VIN [VAC]POUT [mW]
PIN [mW]
Efficiency (%)
IC externally
biased
IC self-biased
IC externally
biased
IC self-biased
90
25
49.7
128
50.30
19.6
115
25
51.5
157
48.54
15.9
150
25
54.7
200
45.70
12.5
180
25
57.3
236
43.63
10.6
230
25
61.7
296
40.52
8.4
265
25
64.8
337
38.58
7.4
Table 9.
Light load performance POUT=50 mW
VIN [VAC]POUT [mW]
PIN [mW]
Efficiency (%)
IC externally
biased
IC self-biased
IC externally
biased
IC self-biased
90
50
82.4
167
60.71
29.94
115
50
85.0
198
58.82
25.25
150
50
89.3
242
55.99
20.66
180
50
93.0
280
53.76
17.86
230
50
98.0
341
51.02
14.66
265
50
101.1
384
49.46
13.02
Figure 22.
PIN vs. VIN at no load and light
load; IC externally biased
(J1 selected)
Figure 23.
PIN vs. VIN at no load and light load,
IC self-biased (J1 not selected)
AM11543v1
0
50
100
150
200
80105
130155
180205
230255
V
IN [VAC]
0
25mW
50mW
AM11544v1
0
50
100
150
200
250
300
350
400
80105
130155
180205
230
255
V
IN [VAC]
0
25mW
50mW



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