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AN2950 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN2950
Description  This document describes
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2950 Datasheet(HTML) 19 Page - STMicroelectronics

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AN2950
Testing the board
Doc ID 15494 Rev 1
19/37
Even if the performance seems to be unproportionally better than the requirement, it is
worth noting that often AC-DC adapter or battery charger manufacturers have very strict
requirements about no load consumption, and if the converter is used as an auxiliary power
supply, the line filter is often the big line filter of the entire power supply that significantly
increases consumption in standby mode.
Even if the ENERGY STAR® program does not have other requirements regarding light load
performance, in order to provide complete information we have also reported the input
power and efficiency of the demonstration board in two other low load cases. Table 15 and
Table 16 show the board’s performances when the output load is 25 mW and 50 mW
respectively.
Figure 24 reports the input power vs input voltage for no load and low load conditions.
Figure 24.
Pin vs VIN at low load
Table 15.
Low load performance - POUT = 25 mW
VIN_AC
POUT (mW)
PIN (mW)
Eff. (%)
PIN-POUT (mW)
90
25
45.5
54.94505
20.5
115
25
46.8
53.4188
21.8
150
25
47.7
52.4109
22.7
180
25
50.4
49.60317
25.4
230
25
55
45.45455
30
265
25
61
40.98361
36
Table 16.
Low load performance - POUT = 50 mW
VIN_AC
POUT (mW)
PIN (mW)
Eff. (%)
PIN-POUT (mW)
90
50
73.5
68.02721
23.5
115
50
76.6
65.27415
26.6
150
50
80
62.5
30
180
50
82
60.97561
32
230
50
84
59.52381
34
265
50
92
54.34783
42



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