DVMH28 Series
HIGH RELIABILITY HYBRID
EMI FILTERS
DESCRIPTION
The DVMH series of hybrid EMI filters is operable
over the full military (-55 °C to +125 °C) temperature
range with no power derating. The DVMH EMI filter
is designed to filter conducted emissions of two
DVHF or one DVTR series DC-DC converters.
These filters are designed and manufactured in a
facility qualified to ISO9001 and certified to MIL-PRF-
38534 and MIL-STD-883.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
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High Reliability
Wide Input Voltage Range: 0 to 50 Volts per
MIL-STD-704
Up to 2.0 Amp Maximum Current
40 dB Minimum Attenuation at 500 kHz
Industry Standard Pinout
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Precision Projection Welded Hermetic Package
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements
Protects Against Conducted Susceptibility
Specified in MIL-STD-461C, CS01 and CS02
Flanged and Non-flanged Versions Available
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVMH28 / DVMH28F EMI Filter
(Not
To Scale)
1X014DSH
11314 4th Avenue
West, Suite 206
Everett, WA 98204
http://www.vpt-inc.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
1
DVMH28 Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Current
Power Dissipation (Full Load, T
CASE
= +125°C)
50 V
DC
80 Volts
2.0 Amps
1.0 Watt
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
-65°C to +150°C
300°C
(24 / 29)
Grams
Parameter
STATIC
INPUT
2
Voltage
Current
1,2,3
Conditions
Min
Continuous
Transient, 1 sec
Continuous
Continuous
Continuous
Continuous
0
-
-
55
10
100
-
0
-
0
DVMH28
Typ
28
-
-
V
OUT
= V
IN
– (I
IN
x R
DC
)
-
-
-
-
-
-
2.49
2.0
250
1.0
-
30
-
-
Units
Max
50
80
2.0
V
V
A
V
A
mΩ
W
dB
nF
MΩ
MHrs
OUTPUT
2
Voltage
Current
2,3
DC RESISTANCE
POWER DISSIPATION
NOISE REJECTION
CAPACITANCE
ISOLATION
MTBF (MIL-HDBK-217F)
2
Continuous
f = 500 kHz
Pin to Case
Any Pin to Case, 500 V
DC
AIF @ T
C
= 55°C
Notes:
1. Derate linearly to 0 at 135°C.
2. Verified by qualification testing.
3. Rated current applies at any voltage.
BLOCK DIAGRAM
PIN 1
28V IN
PIN 3
CASE
PIN 2
28V OUT
IN COM
PIN 5
Figure 2
OUT COM
PIN 4
1X014DSH
2
DVMH28 Series
CONNECTION DIAGRAMS
DVHF2800S DC-DC CONVERTER
8
28V IN
+V OUT
4
LOAD
1
INH
OUT COM
3
7
IN COM
6
CASE
DVMH28 EMI FILTER
1
28V IN
28 Vdc
28V OUT
2
DVHF2800S DC-DC CONVERTER
8
28V IN
1
INH
OUT COM
+V OUT
3
LOAD
4
+
-
5
4
IN COM OUT COM
3
7
IN COM
6
CASE
Figure 4
– DVMH28 EMI Filter Hookup with Two Converters
1X014DSH
4
DVMH28 Series
EMI MEASUREMENT METHODS CONNECTION DIAGRAMS
TO 50 OHM INPUT
+V IN
10 uF
+V OUT
CURRENT
TRANSFORMER
TO D.U.T.
10 uF
-V IN
-V OUT
Figure 5
– MIL-STD-461C Measurement Method (Feedthrough Capacitor)
+V IN
50 uH
+V OUT
TO 50 OHM INPUT
-V IN
50 uH
-V OUT
Figure 6
– MIL-STD-461D Measurement Method (LISN)
1X014DSH
5
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