Reference Manual User guide

All parameters are specified at 12V, 2.5A,230Vac input, 25ªC ambient and after a 5 minutes run-in time, unless noted otherwise.
8 Rockwell Automation Publication 1606-RM030A-EN-P — April 2014
Bulletin 1606 Switched Mode Power Supplies
8. Efciency and Power Losses
AC 400V AC 480V
Efciency typ. 85.4% 85.8% at 12V, 8A
Average efciency *) typ. 84.7% 84.1% 25% at 2A, 25% at 4A, 25% at 6A. 25% at 8A
Power losses typ. 1.5W 1.6W at 0A
8.4W 9.1W at 12V, 4A
typ. 16.4W 15.9W at 12V, 8A
*) The average efciency 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. 8-1 Efciency vs. output current at 12V,
typ.
Fig. 8-2 Losses vs. output current at 12V,
typ.
Efciency
1
82
84
86
81
87%
8
A
245
Output Current
3
83
85
4
0
0
V
a
c
480Vac
67
Power Losses
012 45 8A
0
3
9
15
18W
6
3
12
Output Current
67
400Vac
480Vac
Fig. 8-3 Efciency vs. input voltage at 12V,
8A, typ.
Fig. 8-4 Losses vs. input voltage at 12V, 8A,
typ.
Efciency
320 360 400 440 480
87%
84.5
85.5
86.5
86.0
85.0
84.0
520 560
Input Voltage Vac
Power Losses
320 360 400 440 480
18W
3
9
15
12
6
o
520 560
Input Voltage Vac