Datasheet

DataSheet
40W, Single Output
VER:00 Page 23 of 31 Issued Date：2009/03/02
EMC Considerations (Continued)
Suggested Schematic for EN55022 Conducted Emission ClassB Limits
Recommended Layout with Input Filter
To meet conducted emissions EN55022 CLASS B the following components are needed:
PXF40-24WSxx
Component Value Voltage Reference
C1,C3 4.7uF 50V 1812 MLCC
C5,C6 1000pF 2KV 1206 MLCC
L1 450uH ---- Common Choke
PXF40-48WSxx
Component Value Voltage Reference
C1,C2 2.2uF 100V 1812 MLCC
C3,C4 2.2uF 100V 1812 MLCC
C5,C6 1000pF 2KV 1206 MLCC
L1 830uH ---- Common Choke
This Common ChokeL1 is defined as follows:
■
L: 450μH±35% / DCR:25mΩ, max
Aheight:9.8 mm, Max
■
L: 830μH±35% / DCR:31mΩ, max
Aheight:8.8 mm, Max
■ Test condition:100KHz / 100mV
■ Recommended through hole:Φ0.8mm
■ All dimensions in millimeters