Datasheet

Testing the board AN4260
12/29 DocID024275 Rev 2
The power consumption of the presented board is about six times lower than the limit fixed
by version 4 of the Code of Conduct. Even though the performance seems to be
disproportionally better than requirements, 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 main line
filter of the entire power supply that increases greatly the standby consumption.
Even though version 4 of the Code of Conduct does not have other requirements regarding
light load performance, in order to give a more complete overview, the consumption of the
demonstration board in two other light load cases (P
OUT
= 25 mW and P
OUT
= 50 mW) has
also been measured. The results versus line voltage are plotted in Figure 16, together with
the no load measurements reported in Table 3.
Figure 16. P
IN
vs. V
IN
@ no load and light load
Several criteria can be adopted to measure the performance of a converter. One criterion is
to measure the output power (or the efficiency) when the input power is equal to 1 Watt. This
measurement is shown in Figure 17 for different input voltage values.
Table 4. Energy consumption criteria for no load
Nameplate output power (P
no ) Maximum power in no load for AC-DC EPS
0 to ≤ 50 W < 0.3 W
> 50 W < 250 W < 0.5 W
0
50
100
150
200
80 105 130 155 180 205 230 255
P
IN
[mW]
V
IN
[V
AC
]
0
25mW
50mW
AM16643v1