Datasheet
Testing the board AN4164
16/38 Doc ID 023660 Rev 1
5.5 Light load performance
The input power of the converter has been measured in no load condition for different input
voltages and the results are reported in
Table 6
.
In version 4 of the Code of Conduct, also the power consumption of the power supply when
it is no loaded is considered. The criteria to be compliant with are reported in the table
below:
The performance of the presented board (when the self-biasing function is not used) is
much better than required; the power consumption is more than ten 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 big 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 we report the input power
and efficiency of the demonstration board also in two other light load cases.
Table 8
and
Table 9
show the performance when the output load is 25 mW and 50 mW respectively.
Table 6. No load input power
V
IN
[V
AC
]
P
IN
[mW]
IC externally biased IC self-biased
90 17.6 108
115 18.9 138
150 20.9 179
180 23.1 214
230 26.9 275
265 30.2 317
Table 7. Energy consumption criteria for no load
Nameplate output power (P
no) Maximum power in no load for AC-DC EPS
0 W ≤ P
no
≤ 50 W < 0.3 W
50 W < P
no
< 250 W < 0.5 W