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AN4165 Datasheet(PDF) 18 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) 18 Page - STMicroelectronics

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Light-load performance
AN4165
18/37
Doc ID 023661 Rev 1
9
Light-load performance
The input power of the converter has been measured in no load condition for different input
voltages and the results are given in
Table 7.
In version 4.0 of the Code of Conduct the power consumption of the power supply when it is
not loaded is also considered. The criteria for compliance are given in the table below:
Table 8.
Energy consumption criteria for no load
The power consumption of the STEVAL-ISA111V1 board is about ten times lower than the
Code of Conduct (version 4) limit. Even if this performance seems to be disproportionally
better than the requirements, it is worth noting that often AC-DC adapter or battery charger
manufacturers have very strict requirements about no load consumption and when the
converter is used as an auxiliary power supply, the line filter is often the main line filter of the
entire power supply which considerably increases standby consumption.
Even if the Code of Conduct (version 4) program does not have other requirements
regarding light load performance, in order to give more information the input power and
efficiency of the demonstration board in two other light load cases is also shown.
Table 9
and
Table 10 show the performance when the output load is 25 mW and 50 mW
respectively.
Table 7.
No load input power
VIN [VAC]PIN [mW]
90
13.4
115
14.4
150
16.1
180
18.0
230
22.2
265
24.9
Nameplate output power (Pno)
Maximum power in no load for AC-DC EPS
0 W
≤Pno ≤50 W
< 0.3 W
50 W < Pno < 250 W
< 0.5 W
Table 9.
Light load performance at POUT = 25 mW
VIN [VAC]POUT [mW]
PIN [mW]
Efficiency (%)
90
25
44.9
55.7
115
25
46.3
54.0
150
25
49.1
50.9
180
25
51.5
48.5
230
25
55.0
45.5
265
25
59.0
42.4



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