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AN2929 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN2929
Description  In consumer applications such as LCD or plasma TVs
PDF  32 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2929 Datasheet(HTML) 18 Page - STMicroelectronics

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Testing the board
AN2929
18/32
Doc ID 15333 Rev 2
The performance of the VIPER27LN board is much better than required. The power
consumption is about twelve times lower than the ENERGY STAR® limit. Even if the results
seem to be disproportionally better than the requirements, it is worth mentioning that often
AC-DC adapter or battery charger manufacturers have very strict requirements concerning
no-load consumption and if the converter is used as an auxiliary power supply, the line filter
of the entire power supply is much bigger and considerably increases the standby
consumption.
Even if the ENERGY STAR® program does not have other requirements regarding light-load
performance, in order to give complete information we have provided the input power and
efficiency of the demonstration board in two other low-load cases also. Table 14 and
Table 15 show the performances when the output load is 25 mW and 50 mW respectively.
The input power and the average switching frequency versus the input voltage for different
load conditions are shown in the following figures.
Table 14.
Low-load performance POUT = 25 mW
VIN_AC
POUT (mW)
PIN (mW)
Eff. (%)
PIN-POUT
(mW)
fSW_AVG (kHz)
90
25.760
48
53.22
22.640
2.017
115
26.760
49
54.95
21.940
1.886
230
25.760
61
41.95
35.640
1.461
265
25.760
67
38.74
40.740
1.355
Table 15.
Low-load performance POUT = 50 mW
VIN_AC
POUT (mW)
PIN (mW)
Eff. (%)
PIN-POUT (mW)
fSW_AVG (kHz)
90
51.510
80
64.39
28.490
3.407
115
51.510
82
62.82
30.490
3.177
230
51.510
98
52.56
46.490
2.435
265
51.510
104
49.53
52.490
2.284



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