Datasheet

cui.com
CUI Inc │ SERIES: VHK75W │ DESCRIPTION: DC-DC CONVERTER date 12/16/2013 │ page 4 of 9
DERATING CURVES
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
-403540455055606570758085
Ambient Temperature - degrees C
Relative Output Power - % of nominal output
Natural
Convection
0.5 m/S
(100LFM)
1.0 m/S
(200LFM)
1.5 m/S
(300LFM)
2.0 m/S
(400LFM)
2.5 m/S
(500LFM)
3.0 m/S
(600LFM)
3.5 m/S
(700LFM)
VHK75W Power Derating Curves At Nominal Input
EMC RECOMMENDED CIRCUITS
Figure 1
Figure 2
Recommended Circuit for EN55022 Class A
(for all 3.3, 5, 12, 15, & 24 Vdc output models)
EN55022 CLASS A
Table 1
TEST CONFIGURATION
C1 Cin
L1
To Oscilloscope
+Vin
-Vin
+Vo
-Vo
R-Load
Vi
n
+
-
Note: Input reected-ripple current is measured with an inductor L1 and Capacitor C1 to simulate source impedance.
External components
L1 12μH
C1 220μF, ESR < 0.1Ω at 100 KHz
Cin 100μF, ESR < 0.1Ω at 100 KHz
C4
DC/DC Converter
CASE
+Vo
-Vo
+Vin
C1
-Vin
L2
C3C2
L1
+Vo
-Vo
+Vin
-Vin
-S
+S
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