B3-21
DESCRIPTION
Interpoint's surface mount FMGA-461TM EMI filter has been
designed to work with Interpoint's surface mount MGA and MGH
Series DC/DC converters. Multiple MGA or MGH Series converters
can be operated from a single FMGA filter provided the total power
line current does not exceed the filter's maximum rating. The FMGA
filter will reduce the converter's power line reflected ripple current to
within the limit of MIL-STD-461C, Method CE03 as shown in Figures
4 through 7. The filter uses only ceramic capacitors for reliable high-
temperature operation.
C
ONNECTION AND
O
PERATION
Where more than one pin has the same designation (e.g. pins 7, 8,
and 9 are Positive Output), all of those pins must be connected for
output performance to meet the specifications.
The MGA Series has an internal 2 F capacitor its input terminals
and the MGH Series has an internal 0.47 F capacitor across its
input power terminals. When the MGA or MGH converters are used
with the FMGA filter, this capacitor becomes part of the filter and
forms its final LC output section. When 2 or 3 MGA or MGH
converters are used with a single filter, this capacitor becomes
larger, improving the rejection versus frequency.
T
RANSIENT
D
AMPING
The optional damping circuit shown in Figure 2 will prevent filter
overshoot caused by 80 V transients with rise times of less than 200
microseconds. The damping circuit can be used with a 1.50
resistor in series with the filter's positive input where the additional
line loss can be tolerated. For transients with rise times of greater
than 200 microseconds, there is no overshoot and the damping
circuit is not required.
S
URFACE
M
OUNT
P
ACKAGE
The FMGA EMI filter can be surface mounted with pick-and-place
equipment or manually. It is recommended that the case be
attached with flexible epoxy adhesive or silicone which is thermally
conductive (>1 watt /meter/K).
Internal components are soldered with SN96 (melting temperature
221C) to prevent damage during reflow. Maximum reflow tempera-
ture for surface mounting the FMGA filter is 220C for a maximum
of 30 seconds. SN60, 62, or 63 are the recommended types of
solder. Hand soldering should not exceed 300C for 10 seconds per
pin.
The hermetically sealed metal cases are available in two different
lead configurations. See Section B8, case B.
L
AYOUT
R
EQUIREMENTS
The case of the filter must be connected to the case of the converter
through a low impedance connection to minimize EMI.
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
S
URFACE MOUNT
FMGA EMI FILTER
0.8 AMP
F
EATURES
55C to +125C operation
50 dB min. attenuation at 500 kHz
differential mode
45 dB min. attenuation at 5MHz
common mode
Compliant to MIL-STD-461C, CE03
Compatible with MIL-STD-704A
through E
Size (max.): 1.010 x 0.880 x 0.250 inches (25.65 x 22.35 x 6.35 mm)
Shown with "Gull Wing" lead option, also available with straight
leads. See Section B8, case B, for dimensions and options.
Weight:
10.3 grams typical, 11.5 grams maximum
Screening: Standard or ES. See Section C2 for screening options, see
Section A5 for ordering information.
MODEL
FMGA-461
0.8 amp
RECOMMENDED OPERATING CONDITIONS
TYPICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
0 to 40 VDC continuous
80 V for 100 ms transient
Lead Soldering Temperature (10 sec per lead)
300C
Storage Temperature Range (Case)
65C to +150C
B3-22
FMGA EMI FILTER
0.8 AMP
Input Voltage Range
16 to 40 VDC continuous
Case Operating Temperature (Tc)
55C to +125C full power
Derating Input and Output Current
Derate linearly from 100% at 100C to 0.60 Amps
at 125C case. Above 125C derate to 0%
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
Capacitance
0.045 F max, any pin to case
Isolation
100 megohm minimum at 500 V
Any pin to case, except case pin
FMGA-461
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
INPUT VOLTAGE
CONTINUOUS
0
28
40
VDC
TRANSIENT 100 ms
--
--
80
V
INPUT CURRENT
--
--
0.80
A
DIFFERENTIAL MODE
500 kHz
50
--
--
dB
NOISE REJECTION
5 MHz
45
--
--
COMMON MODE
NOISE REJECTION
2 MHz - 50 MHz
40
--
--
dB
DC RESISTANCE (R
DC
)
TC = 25C
--
--
1.50
OUTPUT VOLTAGE
STEADY STATE
V
OUT
= V
IN
- I
IN
(R
DC
)
VDC
OUTPUT CURRENT
STEADY STATE (<100C CASE)
--
--
0.80
A
INTERNAL POWER
DISSIPATION
MAXIMUM CURRENT
--
--
1.37
W
2 F
6800 pF
500 V
6800 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FMGA-461
>285 H
6 H
2 F
0.014 F / 500 V
0.014 F / 500 V
20
20
0.65
6 H
x 2
x 2
F
IGURE
1: S
CHEMATIC
T
YPICAL
V
ALUES
The case ground connection between the filter and the converter should be as low an impedance as possible
to minimize EMI. Direct contact of baseplate to chassis ground provides the lowest impedance.
MODEL NUMBERING KEY
PIN OUT
TOP VIEW
FMGA
Differently colored glass bead around pin one or dimple in
header (bottom of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corner.
1
2
3
4
5
6
8
9
7
18
17
16
15
14
13
12
11
10
FMGA - 461 Z / ES
Base Model
MIL-STD-461 Reference
Screening
(Standard screening has no designator
in this position.)
Gull Wing Lead Option
(Straight leaded filter has no designator
in this position.)
B3-23
EMI I
NPUT
F
ILTERS
See Section B8, case B, for dimensions and "gull-wing" lead option.
F
IGURE
3: P
IN
O
UT
DSCC NUMBER
DSCC D
RAWING
(5915)
IN PROCESS
FMGA
-461 F
ILTER
S
IMILAR
P
ART
FMGA-461/883
For exact specifications for a DSCC product, refer to the
DSCC drawing. Call you Interpoint representative for status
on the FMGA DSCC models.See Section A3, "SMD/DSCC
Lists", for more information.
FMGA EMI FILTER
0.8 AMP
Pin Description
1, 2
Positive Input
3, 4
No Connection
5, 6
Case Ground
7, 8, 9
Positive Output
10, 11, 12
Output Common
13, 14
Case Ground
15, 16
No Connection
17, 18
Input Common
To meet specified performance, all pins
must be connected except "No
Connection" pins.
RL
Positive
Output
FMGA-461
Positive
Input
Input
Common
Case
Ground
Output
Common
C
R
DC/DC Converter
Input
Common
Case
Ground
Output
Common
RL
Multiple units
allowed up to
rated output current.
The RC output is an optional
damping circuit. It is recommended in
applications where 80 volt line
transients may occur with rise times
<200 s. See text page one
"Connection and Operation."
C = 10 F, 100V
C =
Sprague 109D106X9100C2
R = 2.2 , 5%, 1/4 W, Carbon comp.
Positive
Input
Positive
Output
F
IGURE
2: D
AMPING
C
IRCUIT
B3-24
26221-001-DTS RevA
DQ# 4011
FMGA-461 is a trademark of Interpoint.
Interpoint 1999
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
FMGA EMI FILTER
0.8 AMP
FREQUENCY (MHz)
TWO MGA 2805S CONVERTERS AT FULL LOAD
WITHOUT FILTERING
TYPICAL POWER LINE SPECTRAL NOISE CURRENT
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
100
NARROWBAND
CE03 LIMIT
F
IGURE
4
FREQUENCY (MHz)
TWO MGA 2805S CONVERTERS AT FULL LOAD
WITH FMGA-461 POWER LINE FILTERING
TYPICAL POWER LINE SPECTRAL NOISE CURRENT
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
CE03 LIMIT
NARROWBAND
F
IGURE
5
FREQUENCY (MHz)
TWO MGH 2805S CONVERTERS AT FULL LOAD
WITHOUT FILTERING
TYPICAL POWER LINE SPECTRAL NOISE CURRENT
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
100
CE03 LIMIT
NARROWBAND
F
IGURE
6
FREQUENCY (MHz)
TWO MGH 2805S CONVERTERS AT FULL LOAD
WITH FMGA-461 POWER LINE FILTERING
TYPICAL POWER LINE SPECTRAL NOISE CURRENT
EMISSION LEVEL (dB A)
0.1
1
10
50
90
80
70
60
50
40
30
20
10
0
.015
NARROWBAND
CE03 LIMIT
F
IGURE
7
F
IGURE
8
FREQUENCY (Hz)
MAGNITUDE OF Z
o
(Ohms)
10K
100K
1M
10.0
3.2
1.0
0.32
0.10
1K
2 F external capacitor on filter output
Typical Output Impedance (Z)
With Input Shorted
26221-001-DTS Rev A
DQ# 4011
All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. FMGA-461 is a trademark of Interpoint.
Copyright 1998 - 1999 Interpoint. All rights reserved.
1.000
(25.40)
0.870 (22.10)
0.060 (1.52)
0.075 (1.91)
0.030 (0.76)
0.100 (2.54) 4X
0.100 (2.54) 16X
B8-7
CASE B
C
ASES
CASE B
TOP VIEW
See Figure 6
for pin
configurations.
0.880 max
(22.35)
Materials
Header
Kovar/Nickel/Gold
Cover Kovar/Nickel
Pins Kovar/Nickel/Gold,
matched glass seal
Case dimensions in inches (mm)
Tolerance
0.005 (0.13) for three decimal places
0.01 (0.3) for two decimal places
unless otherwise specified
Cover marking is oriented with pin one
at the upper right corner.
1.010 max
(25.65)
CAUTION
Maximum reflow temperature is 220
C for a
maximum of 30 seconds. SN60, SN62, or SN63
are the recommended types of solder. See below
for Solder Mask instructions.
Hand soldering should not exceed 300
C for 10
seconds per pin.
Differently colored glass bead around pin one or dimple
in header (bottom or side of case) indicates pin one.
(This view shows
straight leads.)
Gull Wing Leads
Option
0.135 ref. (3.43)
Gull wing leads are solder dipped.
Lead dimensions are prior to solder dip.
0.08
(2.0)
0.010 (0.25)
Bottom of case to
bottom of lead
0.055
(1.40)
0.070
(1.78)
0.08 (2.0)
1.140 ref. (28.96)
1
1
FMGA EMI Filter: Screening Standard, ES, or 883
MGH Series: Screening Standard, ES, or 883
TOP VIEW CASE B
0.010
(0.25)
1.870 ref. (47.50)
0.015
(0.38)
0.010
(0.25)
0.900 (22.86)
0.800 (20.32)
0.700 (17.78)
0.600 (15.24)
0.500 (12.70)
0.400 (10.16)
0.300 ( 7.62)
Differently colored glass bead around pin one or dimple in
header (bottom or side of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corn
1
2
3
4
5
6
8
9
7
18
17
16
15
14
13
12
11
10
0.000
0.000
Straight Leads
0.50
(12.7)
0.250 max.
(6.35)
0.200 ( 5.08)
0.100 ( 2.54)
Seam seal
Solder Mask Notes
1. Pad dimensions are for the solder mask opening. Lead common to
each other can be connected underneath as desired.
2. Ground pins should be connected to the center pad for improved
grounding.
3. Center pad should not have a solder mask. Solder, copper, or Au/Ni
plate are preferred over solder for adhesive attach.
4. Solder coat to solder down converter.
5. If less rotation of case is desired, make the pad width 0.020inches
(0.51 mm). Pad length can be extended 0.010 inches (0.25 mm)
towards the case body and as-desired dimension away from the case
body.
6. Do not exceed 220C as measured on the body of the converter (top
or bottom).
7. Attach the body of the case to the board with a thermally conductive
adhesive or SN60, 62, or 63 solder. The adhesive can be electrically
conductive as well. It can be applied as an underfill post solder or
dispensed and cured prior or during solder.
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.
F
IGURE
6: C
ASE
B
F
IGURE
7: C
ASE
B S
OLDER
M
ASK
F
IGURE
5: C
ASE
B M
AXIMUM
D
IMENSIONS
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