AN2753 Datasheet, PDF (14/31 Pages) STMicroelectronics – 6 W single-output VIPer17 demonstration board

Precision of the regulation and output voltage ripple
AN2753
3.1
Table 6. Burst mode related output voltage ripple
V_IN
No load (mV)
10 mA load (mV)
90
6.02
8.96
115
6.63
9.68
230
7.58
11.0
265
7.35
11.8
25 mA load (mV)
10.6
10.4
13.3
13.6
Efficiency
The converter's efficiency is measured under different loads and input voltage operating
conditions. This efficiency was measured at full load and with 75%, 50%, and 25% with
respect to the full load condition for different input voltages applied. The results are given in
Table 7.
Table 7. Efficiency
Efficiency (%)
V_INAC (VRMS)
Full load (0.5 A) 75% load (0.375 A) 50% load (250 mA) 25% load (125 mA)
90
76.92
110
79.33
115
79.75
120
80.17
79.62
80.89
81.03
81.03
80.76
81.19
81.19
81.19
80.32
79.48
79.48
79.48
132
80.70
175
80.91
220
79.64
230
79.33
240
79.02
81.18
80.60
79.48
78.93
78.39
80.98
79.71
77.28
76.50
74.99
78.66
75.17
71.98
71.31
70.65
265
78.11
77.33
72.93
69.05
These results were plotted in the following diagrams. In Figure 16 the efficiency versus V_IN
for four different load values was plotted. In Figure 17 the value of the efficiency versus load
for four different input voltages was plotted.
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Doc ID 14654 Rev 2