DER-110

Dual Output Non-Isolated Power Supply

October 26, 2005

Page 21 of 23

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

10 Conducted EMI

A conducted EMI scan of the prototype was taken to determine the effectiveness of the

input pi-filter and transformer ESHIELD® construction. The following plots show the peak

performance of the converter against quasi-peak (QP) and average (AVG) limits of

EN55022 Class B. Both scans were taken at 120VAC/60Hz input with maximum load

applied to the outputs. Since the peak scans are below the average limits, it is expected

that the QP and Average scans would have greater than 10db of margin below the limits.

Figure 22

Figure 23 – Conducted EMI (Neutral), Maximum Load, 120 VAC, 60 Hz, and EN55022 B Limits