MIL-STD-461 EMI INPUT FILTER
FGDS-2A-50V up to 2A CURRENT
Hi-Rel
Hi-Rel
Grade
Grade
2A EMI Filter Module
9 to 50 VDC Input Range
MIL-STD-461C/D/E Complian
• To comply with MIL-STD-461D/E power leads :
• CE 102 : Emission requirement over 10KHz to 10MHz
• CS 101 : Susceptibility requirement over 30Hz to 150KHz
• CS 114 : Susceptibility requirement over 10KHz to 400MHz
• CS 115 : Susceptibility requirement for spikes
• To comply with MIL-STD-461C power leads :
• CE 03 : Emission requirement over 15KHz to 50MHz
• CS 01 : Susceptibility requirement over 30Hz to 50KHz
• CS 02 : Susceptibility requirement over 15KHz to 400MHz
• CS 06 : Susceptibility requirement for spikes
• To comply with DO-160C/D/E power lines :
• Conducted emission requirement over 15KHz to 30MHz
• Conducted susceptibility requirement over 10KHz to 400MHz
• Susceptibility requirement for induced transients
• Temperature range :
• operating temperature : -40°C/+105°C case
• storage temperature : -55°C/+125°C
The GAIA Converter filter module FGDS-2A-50V
provides a state-of-the-art product to fulfill
Electromagnetic Interferences (EMI) requirements
for Aerospace/Defence applications.
The FGDS-2A-50V complies with major standards
including :
•
the US MIL-STD-461 rev C, rev D and rev E
•
the international DO-160 rev C, rev D and rev E
In particular, the filter module is compliant with
the following requirements of MIL-STD-461C/D/E
standards :
•
MIL-STD-461D/E Part 2. & 3. requirements :
•
Conducted Emission (CE)
•
CE102, power leads, emission over
10KHz to 10MHz, basic curve
•
Conducted Susceptibility (CS)
•
CS101, power leads, frequency 30Hz
to 150KHz, curve #1
•
CS114, bulk cable injection, frequency
10KHz to 400MHz,
•
CS115, spikes, bulk cable injection,
calibrated spike
•
DO-160-C/D/E requirements :
•
Conducted Emission (CE)
•
Section 21 power lines, emission over
15KHz to 30MHz, category B, AZ & LMH
•
Conducted Susceptibility (CS)
•
Section 20 power lines, frequency 10KHz
to 400MHz
In addition, this filter withstands in a transparent
state without dammage the transient and spike
requirements of :
•
MIL-STD-704A with 80V/100ms & 600V/10µs
•
MIL-STD-1275B with 100V/50ms & 250V/70µs
The FGDS-2A-50V is suitable for all GAIA
Converter DC/DC converters and architecture
•
from 4W up to 50W power
•
up to 2A input current
•
up to 50V permanent input voltage.
1-General
•
MIL-STD-461C Part 2. & 3. requirements :
•
Conducted Emission (CE)
•
CE03, power leads, emission over
15KHz to 50MHz, narrowband, Class A1
•
CE03, power leads, emission over
15KHz, broadband, Class A1 curve#
1&2
•
Conducted Susceptibility (CS)
•
CS01, power leads, frequency over 30Hz
to 50KHz, class A1, consult factory
for criteria
•
CS02, power leads, frequency 15KHz
to 400MHz, class A1
•
CS06, power leads, spike #1
6
2-Product Selection
FGDS-2A-50V (/T) and/or (/S)
(/T) : option for -55°C start up operating temperature.
(/S) : option for screening and serialization
REDEFINING THE SOURCE OF POWER
©
Gaia Converter FC05-050.03/08 Revision B
For locations, phone, fax, E-Mail see back cover
EMI Filter FGDS-2A-50V
3- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
Parameter
Input
Nominal input voltage
Full temperature range
Nominal
VDC
Conditions
Limit or
typical
Units
Hi-Rel
Grade
FGDS-2A-50V
28
Permanent input
voltage range (Ui)
Full temperature range
Min. - Max.
VDC
9 - 50
Transient input voltage
Output
Output power
Full load
Maximum
Maximum
VDC/ms
VDC/ms
80/100
100/50
Full temperature range
Ui min. to max.
Full temperature range
Ui min. to max.
Maximum output current
Maximum
W
50
Permanent output current
Min. - Max.
A
0-2
Power dissipation
Maximum
W
1
DC resistance
General
Electrical strengh test
voltage
Maximum output current
Min. - Max.
mOhm
120 - 140
Case to any pin
Gnd pin to any other pin
Conditions Gf
Conditions AIC
Minimum
Minimum
@40°C
@85°C
@40°C
@85°C
VDC
VDC
Hours
Hours
Hours
Hours
500
500
23 000 000
6 000 000
12 300 000
3 300 000
Reliability data MTBF
according MIL-HDBK-217F
EMI compliance
6
Conducted emission
Power leads
Power leads
Power lines
Power lines
MIL-STD-461C
MIL-STD-461D/E
DO-160C catA, B & Z
DO-160D/E cat B & LMH
CE03
CE102
Section 21
Section 21
See section 6
See section 6
/
/
Spikes & surges
withstands
50 Ohm impedance
0.1 Ohm impedance
50 Ohm impedance
15 mJ energy content
50 Ohm impedance
MIL-STD-461C
MIL-STD-461C
MIL-STD-461D/E
MIL-STD-1275B
DO-160C/D/E
DEF STANAG
CS06 : 600V/10µs
CS06 : 200V/150ns
CS115
Level 250V/70µs
Section 22 : 600V/10µs
Compliant
Compliant
Compliant
Compliant
Compliant
Compliant
©
Gaia Converter FC05-050.03/08 Revision B
2
For locations, phone, fax, E-Mail see back cover
EMI Filter FGDS-2A-50V
4- EMI Filter Electrical Schematics
The GAIA Converter FGDS-2A-50V is suitable for all GAIA Converter DC/DC converters and combinations :
•
from 4W up to 50W total input power and up to 2A input current
•
up to 50V permanent input voltage
and
up to 100V transient input voltage during 50ms
Hi-Rel
Grade
4-1 EMI Filter Electrical Schematics in Front of MGDM-04/10/18/20/26 & CGDM Series
The GAIA Converter FGDS-2A-50V can be used directly in front of any DC/DC converter and combinations
using of MGDM-04, MGDM-10, MGDM-18, MGDM-20, MGDM-26 and CGDM series. For better EMI performance and
stability purpose, GAIA Converter recommends to use a RC cell (see section 4-4) together with a common mode
noise capacitance Cc (10nF typical) connected between Gin and Gout pins of each DC/DC converter.
VI
Vo
VI
Vo
EMI input filter
FGDS-2A-50V
GI
Gnd
Go
R*
MGDM-series
C*
GI
Go
Cc
4-2 EMI Filter Electrical Schematics in front of MGDM-25, MGDM-35 Series
The GAIA Converter FGDS-2A-50V can be used by adding an LC cell in front of any DC/DC converter and combinations
of MGDM-25, MGDM-35 series. For better EMI performance and stability purpose, GAIA Converter recommends to
use a RC cell (see section 4-4) and a LC cell (L=4.7µH, C=4.7µF) together with a common mode noise capacitance
Cc (10nF typical) connected between Gin and Gout pins of each DC/DC converter.
LC cell
VI
Vo
VI
Vo
EMI input filter
FGDS-2A-50V
GI
Gnd
Go
R*
MGDM-series
C*
GI
Go
6
Cc
4-3 EMI Filter Electrical Schematics in Front of Pre-regulator PGDS Series :
The GAIA Converter FGDS-2A-50V can be used directly in front of pre-regulators PGDS series with any DC/DC
converter and combinations of MGDM-04, MGDM-10, MGDM-18, MGDM-20, MGDM-26 and CGDM series.
For better EMI performance and stability purposes, GAIA Converter recommends to use a RC cell (see section 4-4)
together with a common mode noise capacitance Cc (10nF typical) connected between Gin and Gout pins of each converter.
Vimes
VI
Vo
VI
Vo
VI
Vo
EMI input filter
FGDS-2A-50V
GI
Gnd
Go
R*
PGDS50
C*
MGDM-series
GI
On/off
Go
GI
Go
Cc
©
Gaia Converter FC05-050.03/08 Revision B
3
For locations, phone, fax, E-Mail see back cover
EMI Filter FGDS-2A-50V
4- EMI Filter Electrical Schematics (continued)
4-4 R*C* Network Discussion
Hi-Rel
Grade
The
RC damping network is a network used for stability purposes in negative input impedance systems such as DC/DC
converters.
R and C is a network whose function is to lower the filter’s output impedance.
The value of the capacitor C strongly depends on the application’s conditions (input voltage range and total power drawn
from the source) as well as the standards that the equipment has to meet MIL-STD-461C, or D/E, ... this because
measurements method (LISN) differs from one standard to another affecting the C value.
DC/DC converters are negative input impedance systems whereas a filter composed of passive elements displays a positive
output impedance to the converter. To ensure the stability of the whole system “LISN + input Filter + DC/DC converters”, the
filter output impedance must be kept below the converter’s input impedance, which is given by
the
following formula :
Vin
2
Vin
2
x
h
Zin =
____
=
_________
Pin
Po
where :
Vin
is the converter input voltage,
Pin is the converter input power,
Po is the converter output power
h
is the efficiency of the converter.
As it can be seen from the preceding equation, the worst case for system’s stability is at Vinmin, so this is the condition
which should be considered for the filter design.
As the filter is made of low ESR inductors and ceramic capacitors, it has an important Q which causes a sharp increase of
the filter’s output impedance at the resonant frequency and leads to a violation of the stability criteria, causing the system
to break into oscillations.
Consequently, the values of C and R have to be adjusted to dampen sufficiently the filter’s resonance and make its
output impedance lower than the converter’s input impedance (a 10dB margin between both values is recommended).
The following formula can be used to determine the capacitor value :
( L
LISN
+ 4 .10
-6
) x Po x k
C >
_________________________________
6
Vin
2
x (R + R
L
)
Where :
LLISN is the LISN inductor value
Po is the filter output power
R is the capacitor esr (equivalent serial resistor) of C
RLis the input bus equivalent resistor. It is the sum of the line + LISN network + input connector resistors
k is the stability margin factor.
This factor is given by the following formula : Stability margin (dB) = 20 log (k)
Vin is the converter input voltage
©
Gaia Converter FC05-050.03/08 Revision B
4
For locations, phone, fax, E-Mail see back cover
EMI Filter FGDS-2A-50V
5- MIL-STD-461C/D/E Conducted Emission Tests Set-Up
5-1 MIL-STD-461C Measurement Method
The conducted noise emission measurement
method of MIL-STD-461C is described in MIL-
STD-462C standard.
The «DUT» (Device Under Test) is powered thru
a 1 meter lengh parallel wire.
One end is terminated with the DUT and the other
end is terminated with 10µF capacitors to the
ground plane. The measurements are made with
a current probe, the unit of measurement being
dBµA.
To 50 ohms input
Hi-Rel
Grade
+28V in
Current probe
10µF
+28V out
DUT
10µF
Return in
Return out
1m
5-2 MIL-STD-461D/E Measurement Method
The conducted noise emission measurement
method is described in the MIL-STD-461D/E stan-
dards.
The «DUT» (Device Under Test) is powered thru
a 2 meters length parallel wire.
One end is terminated with the DUT and the other
end is terminated with LISN networks.
The measurements are made with a measurement
receiver, the unit being dBµV
6
+28V out
+28V in
LISN
To 50 ohms
input receiver
To 50 ohms
termination
DUT
LISN
Return in
Return out
2m
©
Gaia Converter FC05-050.03/08 Revision B
5
For locations, phone, fax, E-Mail see back cover
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