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AN4116 датащи(PDF) 19 Page - STMicroelectronics

номер детали AN4116
подробное описание детали  This document describes a 12 V-350 mA power supply
PDF  38 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4116 датащи(HTML) 19 Page - STMicroelectronics

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AN4116
Testing the board
Doc ID 023220 Rev 1
19/38
Depending on the equipment supplied, we can 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 one watt. In
Table 10 the output power needed to
have 1 W of input power in different line conditions is reported.
Figure 24 and 25 show the
diagram of the output powers corresponding to PIN = 1 W for different values of the input
voltage.
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
230255
V
IN [VAC]
0
25mW
50mW
Table 10.
POUT @ PIN=1 W
VIN [VAC]PIN [W]
POUT [W]
Efficiency (%)
IC externally
biased
IC self-biased
IC externally
biased
IC self-biased
90
1
0.78
0.64
78
64
115
1
0.77
0.60
77
60
150
1
0.73
0.55
73
55
180
1
0.70
0.49
70
49
230
1
0.68
0.43
68
43
265
1
0.65
0.40
65
40



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