ST VIPer12A-E - EMI Conducted Testing

AN2544 Circuit operation
15/17
Figure 14. Efficiency
Efficiency is about 75% at 120 V
ac
. Efficiency is better at higher output voltages.
1.10 EMI conducted
EMI was checked for all four versions for maximum peak reading.
Efficiency VS Input Line for 12V output
60%
65%
70%
75%
80%
85%
80 100 120 140 160 180 200 220 240 260
Input Line
Efficiency
effic. @ 100ma effic. @ 200ma effic. @ 350ma
Figure 15. VIPer22-E, 12 V at 350 mA output Figure 16. VIPer12-E, 12 V at 200 mA output