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FM-704A データシート(PDF) 1 Page - Interpoint Corporation Company

部品番号 FM-704A
部品情報  EMI Input Filter and Transient Suppression Module
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メーカー  INTERPOINT [Interpoint Corporation Company]
ホームページ  http://www.interpoint.com
Logo INTERPOINT - Interpoint Corporation Company

FM-704A データシート(HTML) 1 Page - Interpoint Corporation Company

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Description
The Interpoint™ FM-704A™ EMI Filter and Transient
Suppression Module combines EMI filtering and transient
protection to handle the demanding requirements of military,
aerospace and industrial applications. As an EMI filter the
FM-704A filter reduces the reflected ripple current from DC/DC
switching converters. As a protection module, it suppresses input
transients on the power bus to protect the converter and other
downstream components.
MIL-STD NoISe MaNageMeNT
When used in conjunction with Interpoint converters, the
FM-704A EMI filter reduces reflected input ripple current by a
minimum of 60 dB at 500 kHz and 55 dB at 1 MHz (see Electrical
Characteristics table on page 5 and Figures on page 6). This
attenuation gives the converter/filter combination performance
exceeding MIL-STD-461C’s CE03 test. Although the FM-704A
filter effectively attenuates the ripple generated by switching
converters, it will not suppress RF applied to its input terminals.
TeMperaTure operaTIoN
FM-704A filters are rated to operate from -55°C to +125°C
baseplate temperature. To meet MIL-STD-1275A and MIL-STD-
704A requirements, derate output power linearly from 40 watts at
105°C to 20 watts at 125°C. See Figure 9.
proTecTIoN
To provide protection for itself and converters, the FM-704A filter
blocks transients as required by the following standards:
MIL-STD-704A
Panavia SP-P-90001
MIL-STD-461A through F British Standard BS3G100
MIL-STD-1275
Civil Aircraft D0160B
Refer to the Electrical Characteristics table on page 5 for more
information.
Reverse polarity spikes of up to 100 V will not damage the filter,
however the spikes will not be blocked by the filter.
INTerNaL power DISSIpaTIoN
To keep internal power dissipation to safe operating levels, the
input current should never exceed 2.5 amps at 16 Vin or 1.0 amp
at 40 Vin. When the FM-704A filter is used with PWM (Pulse
Width Modulated) converters, Iline will vary as Power / Vline
and 2.5 amps maximum at 16 Vin will reduce to approximately 1
amp maximum at 40 Vin. The maximum value allowed may be
less than 1 amp as determined by line transients and the safe
operating area of Figure 9.
Figure 9 illustrates the maximum allowed internal dissipation for
the FM-704A filter. To calculate watts dissipated, subtract 40
volts from the transient (VT) to determine the maximum voltage
across the filter and multiply the result by the current (the filter’s
output power, Pout divided by 40):
W = (VT - 40) x Pout /40
For example, with 20 watts output and a transient of 400 volts:
W = (400 - 40) x 20/40 = 180
The curve of Figure 9 shows that 180 W can be dissipated for up
to 4 milliseconds.
FeaTureS
The inhibit function allows the FM-704A filter to be used as a
high-side switch. When the inhibit terminal (pin 6) is left open or
pulled high, the FM-704A filter is enabled. When the terminal is
grounded, the filter shuts off output power.
A soft start function helps reduce inrush current and start-up
overshoot when the filter is initially powered or when it is
released from the inhibit mode.
An undervoltage lockout feature shuts off output power when
input voltage falls below a specified level. Refer to Figure 8 for
more information.
LayouT requIreMeNTS
To minimize EMI, common mode noise, the case of the filter
must be connected to the case of the converter through a low
impedance connection.
MoDEL
FM-704A
40 WATT
Features
active transient suppression
undervoltage lockout
-55°C to +125°C operation
16 to 40 VDC input
Up to 60 dB attenuation at 500 kHz.
Inhibit function
Compliant to MIL-STD-461A-F
Crane Aerospace & Electronics Power Solutions
FM-704a eMi input Filter and transient suppression Module
Crane Aerospace & Electronics
Power Solutions - Interpoint Products
10301 Willows Road NE, Redmond, WA 98052
+1.425.882.3100•power@crane-eg.com
www.craneae.com/interpoint
Page 1 of 9
FM-704A Rev C - 2011.11.07
28 Volt input – 40 Watt


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