Datasheet

AN4165 Light-load performance
Doc ID 023661 Rev 1 19/37
The input power vs. input voltage for no load and light load condition ( Ta bl e 7 , 9 and 10 ) are
shown in the figure below.
Figure 21. P
IN
vs. V
IN
at no load and light load
It’s possible to have several criteria to measure the standby or light load performance of a
converter. One criterion is the measurement of the output power when the input power is
equal to one watt. In
Table 11 the output power needed to have 1 W of input power in
different line conditions is given.
Figure 22 shows the output power corresponding to P
IN
= 1
W for different values of the input voltage.
Table 10. Light load performance at P
OUT
= 50 mW
V
IN
[V
AC
]P
OUT
[mW] P
IN
[mW] Efficiency (%)
90 50 76.7 65.2
115 50 78.5 63.7
150 50 82.0 61.0
180 50 85.0 58.8
230 50 90.0 55.6
265 50 94.0 53.2
Table 11. P
OUT
@ P
IN
= 1 W
V
IN
[V
AC
]P
IN
(W) P
OUT
(W) Efficiency (%)
90 1 0.788 78.8
115 1 0.781 78.1
150 1 0.76 76.0
180 1 0.74 74.0
230 1 0.70 70.0
265 1 0.686 68.6
AM11570v1
0
25
50
75
100
125
150
175
200
80105130155180205230255
Pin [mW]
VIN [V AC ]
0
25mW
50mW