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TECHNICAL DATASHEET
Rev. D
FEMLV-1275
MIL-STD-1275D
Front End Filter Module for LV Series DC/DC Converters
Applications:
•
Features:
MIL-STD-1275D 28V Vehicle Electrical
•
System Compliance
•
Voltage Surge and Spike Filtering
Surge and Spike Protection for up to 150
Watts
•
PS Shutdown Pin to Remotely Disable
Downstream Device for Protection
•
Allows LV Series to Operate Through MILSTD-1275 Disturbances
•
Mass 0.190lbs
Description:
The Wall Industries Front End filter Module (FEMLV-1275) was designed with the LV Series DC-DC
converter in mind. This Module will allow an LV series DC-DC converter to be used safely in 28V
Vehicle Electrical System requirements set forth by MIL-STD-1275D. Other requirements such as
MIL-STD-461E may apply but are not discussed in this data sheet and additional circuitry may be
required.
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Rev D
TECHNICAL DATASHEET
FEMLV-1275
MIL-STD-1275D Test Results
Detailed
Requirements
Test Conditions
5.1.2.1
Starting Disturbances
5.1.2.2
Vehicle System Voltage
Initial Engagement Surges pulsed to 6V for less than
1 Second.
5.1.2.3
Cranking Level
5.1.3
Normal Operation Mode
5.1.3.1
Steady-state Voltage
Detailed Results
Figure or Picture
No damage to converter.
Photo 1.
Converter operates
normally before, and after.
Vehicle System Voltage at No damage to converter.
Photo 2.
16V for 30 Seconds.
Converter operates
Returned to 28V for 1
normally before, and after.
Minute 30 Seconds, and
repeated 2 more times.
Vehicle System Voltage =
25 – 30V.
No damage to converter.
Converter operates
normally before, during,
and after.
Photo 3.
5.1.3.2
Ripple
Vehicle System Voltage =
25 – 30V with ±2V ripple,
Frequency @ 50Hz,
12kHz, 48kHz and
200kHz
No damage to converter.
Converter operates
normally before, during,
and after.
Figure 1.
5.1.3.3
Surges
Vehicle System Voltage =
25 – 30V. Pulse of +40V,
50mS duration imported.
No damage to converter.
Converter operates
normally before, during,
and after.
Photo 4 and Figure 2.
5.1.3.4
Spikes
Vehicle System Voltage =
25 - 30V. Pulse of
±250V, 70µS duration
No damage to converter.
Converter operates
normally before, during,
and after.
Photo 6 and Figure 3.
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Rev D
5.1.4
Generator-Only Mode
5.1.4.1
Steady-State Voltage
TECHNICAL DATASHEET
FEMLV-1275
Vehicle System Voltage =
23 – 33V.
No damage to converter.
Converter operates
normally before, during,
and after.
Photo 3.
5.1.4.2
Ripple
Vehicle System Voltage =
23 – 33V with ±7V ripple,
Frequency @ 50Hz,
12kHz, 48kHz and
200kHz
No damage to converter.
Converter operates
normally before, during,
and after.
Figure 1.
5.1.4.3
Surges
Vehicle System Voltage =
23 – 33V. Pulse of
+100V, 50mS duration
imported.
No damage to converter.
Converter should operate
normally before, during
and after. Output of Filter
Module will be briefly
interrupted and PS
Control will be pulled
low.
Photo 5 and Figure 2.
5.1.4.4
Spikes
Vehicle System Voltage =
23 – 33V
No damage to converter.
Converter operates
normally before, during,
and after.
Photo 6 and Figure 3.
5.3.2.2
Voltage Spikes Exported
Vehicle System Voltage =
23 - 33V.
No spikes, outside of
Normal Operating Mode
were transmitted to
converter.
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TECHNICAL DATASHEET
FEMLV-1275
Rev D
Graph 1: De-rating Curve of FEMLV-1275
Output power (watts)
Maximum power Derating Curve during
MIL-STD-1275D 100v pulse
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
80
100
Ambient Temperature Degrees Celsius
Max case temperature: 100 degrees Celsius
Max average current (under normal operating voltages): 15 amps
Max peak single pulse current less than 50ms (under normal operating voltages): 50 amps
*Due to advances in technology, specifications subject to change without notice.
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Rev D
TECHNICAL DATASHEET
FEMLV-1275
Photo 1: Ch1 – Vin;
Ch2 – Vout of LV Module
Photo 2: Ch1 – Vin;
Ch2 – Vout of LV Module
Photo 3: Ch1 – Vin;
Ch2 – Vout
Photo 4: Ch1 - Vin
Photo 5: Ch1 – Vin
Photo 6: Ch1 - Vin
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Rev D
TECHNICAL DATASHEET
FEMLV-1275
Figure 1: Ripple Test Set-Up
Figure 2: Imported Surge Test Set-Up
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Rev D
TECHNICAL DATASHEET
FEMLV-1275
Figure 3: Imported Spikes Test Set-Up
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Rev D
TECHNICAL DATASHEET
FEMLV-1275
Figure 4: Mechanical Dimensions
Unit: inches [mm]
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Page 8 of 9
Rev D
TECHNICAL DATASHEET
FEMLV-1275
Company Information:
Wall Industries, Inc. has created custom and modified units for over 50 years. Our in-house research and development
engineers will provide a solution that exceeds your performance requirements on time and on budget. Our ISO9001-2008
certification is just one example of our commitment to producing a high quality, well-documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working
closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to
provide ongoing support for your project above and beyond the design and production phases. Give us a call today to discuss
your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
(888) 597-WALL
(603)778-2300
 (888)587-9255
 (603)778-9797
sales@wallindustries.com
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
www.wallindustries.com
Page 9 of 9