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Bulletin 1606 Switched Mode Power Supplies
9. Efficiency and Power Losses
Efficiency
Average efficiency *)
Power losses
*)
The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%
of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%
of the nominal load for the rest of the time.
Fig. 9-1
Efficiency vs. output current at 48V,
typ.
Efficiency
93%
92
91
90
89
88
87
86
85
1
1.5
2
2.5
Efficiency vs. input voltage at 48V,
Fig. 9-3
5A, typ.
Efficiency
94%
93
92
91
90
89
88
85
120
155
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time, unless noted otherwise.
10
AC 100V
typ.
90.4%
typ.
89.6%
typ.
5.6W
typ.
25.5W
230Vac
120Vac
100Vac
Output Current
3
3.5
4
4.5
5A
Input Voltage
190
225 260Vac
Rockwell Automation Publication 1606-RM045A-EN-P — March 2014
AC 120V
AC 230V
91.2%
92.0%
90.0%
90.3%
5.7W
5.9W
23.2W
20.9W
Fig. 9-2
Losses vs. output current at 48V, typ.
Power Losses
27W
24
21
18
15
12
9
6
3
0
1
2
Losses vs. input voltage at 48V, 5A,
Fig. 9-4
typ.
Power Losses
32W
28
24
20
16
12
8
85
120
155
at 48V, 5A
25% at 1.25A, 25% at 2.5A,
25% at 3.75A, 25% at 5A
at 48V, 0A
at 48V, 5A
100Vac
120Vac
230Vac
Output Current
3
4
5A
Input Voltage
190
225 260Vac
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