page
date
9 of 11
08/2009
PART NUMBER:
VHK50W
DESCRIPTION:
chassis mount dc-dc converter
17. INPUT FILTERING AND EMI INTERFERENCE
The VHK50W converters have input capacitors that control input current ripple and the associated EMI interference. However, it
has not been tested to a formal standard for conducted emissions. Additional filtering may be needed to ensure compliance to an
EMI standard. Refer to FIGURE 10.1 and 10.2 for reference circuits.
FIGURE 10.1. EMI FILTER FOR VHK50W, 3.3 ~ 24 V
L1
C1
C2
+Vin
+Vo
-Vin
CASE
-Vo
C3
VHK50W Series
C2
47μF/50V
EMI to meet class A
ESR<0.60
EMI to meet class B
220μF/50V
ESR<0.120
C3
47μF/50V
ESR<0.60
220μF/50V
ESR<0.120
C4
2200pF/2KV
2200pF/2KV
L1
2.5μH
1.5μH
FIGURE 10.2A. EMI FILTER FOR VHK50W, 28 V (CLASS A)
L1
C1
C2
+Vin
+Vo
-Vin
CASE
-Vo
C3
Model No.
VHK50W-Q24-S28
VHK50W-Q48-S28
C1
100uF/50V KY
100uF/100V KY
C2
100uF/50V KY
100uF/100V KY
C3
2200pF/2KV
2200pF/2KV
L1
3.4uH
3.4uH
note: The recommended components are a starting point but not guaranteed for meeting these EMI requirements. More or less
filtering may be required for a specific application or to meet other EMI standards, e.g.MIL-STD-461
20050
SW
112
th
Ave. Tualatin, Oregon
97062
phone
503.612.2300
fax
503.612.2383
www.v-infinity.com
CUI [ CUI INC ]
