PD - 94586A
AFV461 SERIES
ADVANCED ANALOG
EMI FILTER
Description
The AFV461 EMI filter will reduce the input line re-
flected ripple current of all DC/DC converter families to
levels below the CEO3 limits of MIL- STD-461. This
filter is intended for applications requiring compatibil-
ity to MIL-STD-704A.
These EMI filters are manufactured in a facility certified
to MIL-PRF-38534 and are available with military
screening. Four grades are offered with different screen-
ing options. Refer to Part Number section.
AFV
Features
4.0 amp Input Current - max.
40 dB Noise Reduction min. @100 KHz
-55°C to +125°C Operation
Military Screening
Compatible with all stanard 28 Volts Input
DC/DC Converters
n
No Derating for -55°C to +125°C Operation
n
No Tantalum Capacitors for High Reliability
n
n
n
n
n
Typical Application
+Vin
+Vout
+Vin
Case
System
Bus
Input Return
AFV461
EMI Filter
Case
AHV28XX
(or Other)
DC/DC Converter
+Vout
R
L
Output Return
Input Return
Output Return
+Vin
Case
AHV28XX
(or Other)
DC/DC Converter
+Vout
R
L
Input Return
Output Return
To other converters up
to rated output current
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1
11/21/02
AFV461 Series
AFV461 Block Diagram
10µH
1
1800
pFd
3
11µF
11µF
1800
pFd
5
4
5µH
2
0.2Ω
0.2Ω
Refer to last page for Pin Designation
Device Synchronization
Whenever multiple DC/DC converters are utilized in
a single system, significant low frequency noise may
be generated due to slight difference in the switch-
ing frequencies of the converters (beat frequency
noise). Because of the low frequency nature of this
noise (typically less than 10KHz), it is difficult to filter
out and may interfere with proper operation of sen-
sitive systems (communications, radar or telemetry).
Advanced Analog offers an option, which provides
synchronization of multiple AHE/ATW type convert-
ers, thus eliminating this type of noise. To take ad-
vantage of this capability, the system designer must
assign one of the converters as the master. Then, by
definition, the remaining converters become slaves
and will operate at the masters’ switching frequency.
The user should be aware that the synchronization
system is fail-safe; that is, the slaves will be continue
operating should the master frequency be inter-
rupted for any reason. The layout must be such that
the synchronization output of the master device is
connected to the synchronization input of each slave
device. It is advisable to keep this run short to mini-
mize the possibility of radiating the 250KHz switch-
ing frequency. A typical connection is illustrated on
the cover sheet of this document.
The appropriate converters must be ordered to take
advantage of this feature. After selecting the con-
verters required for the system, a ‘MSTR’ suffix is
added for the master converter part number and an
‘SLV’ suffix is added for slave part number. See Part
Number section of the applicable converter data
sheets.
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3
AFV461 Series
AFV461 Case Outlines
Non-Flanged
0.040 D (1.02) X
0.26 L (6.60) P ins
0.800
(20.32)
Flanged
0.050
(1 .27)
0.040 D (1 .02 ) X
0.26 L (6 .60 ) Pin s
0.800
(2 0.32 )
2
3
4
2
3
4
2.120
M ax
(53.85)
1.600
(40.64)
2.870
(7 2.90 )
M ax
2.550
(6 4.77 )
2.110
(5 3.59 )
M ax
1.600
(4 0.64 )
1
5
1
5
1.120 M ax
(28.45)
0.380
M ax
(9.65)
1.110
(2 8.19 )
0.380
(9 .65)
M ax
Ø 0 .16 2
(4 .12)
2 H oles
Pin Designation
Pin No.
1
2
3
4
5
Designation
+ Vin
+ Vout
Case
Output Return
Input Return
Part Numbering
AFV 461 F / CH
M o del
Applica ble
M ilita ry Test
Standard
Screening
—
, ES, HB, C H
C a se Style
O m it fo r S ta n d a rd
Available Standard Miliatary Drawing (SMD) Cross Reference
Standard
Military Drawing
PIN
91020-02HXA
91020-02HZA
Vendor
CAGE
Code
52467
52467
Vendor
Similar
PIN
AFV461/CH
AFV461F/CH
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
ADVANCED ANALOG:
2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 11/02
4
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