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| 型号： | FMSA-461/883 |
| 厂商： | CRANE ELECTRONICS INC |
| 元件分类： | 数据传输滤波器 |
| 英文描述： | EMI INPUT FILTER 28 VOLT INPUT |
| 中文描述： | 1 FUNCTIONS, 40 V, 0.8 A, DATA LINE FILTER MODULE |
| 封装： | METAL PACKAGE-8 |
| 文件页数： | 7/14页 |
| 文件大小： | 282K |
| 代理商： | FMSA-461/883 |
FMSA/FMGA EMI Input Filters
Crane Aerospace & Electronics Power Solutions
Page 2 of 14
Rev D - 20060508
www.craneae.com
28 VOLT INPUT – 0.8 AMP
FMGA SERIES EMI FILTER
Interpoint’s surface mount FMGA-461 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.
CONNECTION AND OPERATION
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 μF capacitor its input terminals
and the MGH Series has an internal 0.47 μF 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.
TRANSIENT DAMPING
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 Ω
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.
SURFACE MOUNT PACKAGE
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
221°C) to prevent damage during reflow. Maximum reflow tempera-
ture for surface mounting the FMGA filter is 220°C for a maximum
of 30 seconds. SN60, 62, or 63 are the recommended types of
solder. Hand soldering should not exceed 300°C for 10 seconds per
pin.
The hermetically sealed metal cases are available in two different
lead configurations. See case B for dimensions and options.
LAYOUT REQUIREMENTS
The case of the filter must be connected to the case of the converter
through a low impedance connection to minimize EMI.
2
F
6800 pF
500 V
6800 pF
500 V
Positive
Input
Common
Positive
Output
Common
FMGA-461
>285
H
6
H
2
F
0.014
F / 500 V
20
0.65
6
H
0.014
F / 500 V
0.014
F / 500 V
x 2
FIGURE 1: FMGA TYPICAL SCHEMATIC
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.
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