stf28-461 Interpoint Corp., stf28-461 Datasheet

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stf28-461

Manufacturer Part Number
stf28-461
Description
Stf28-461 Emi Input Filters
Manufacturer
Interpoint Corp.
Datasheet
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • electronics@craneae.com
www.craneae.com
FEaTuRES
DESCRIPTION
The STF28-461™ EMI filter module has been designed as
a companion for Interpoint SMSA flyback power converters.
Multiple SMSA power converters can be operated from a single
filter provided the total power line current does not exceed the
filter maximum rating. The STF filter will reduce the SMSA’s
power line reflected ripple current to within the limit of MIL-STD-
461C, Method CE03. The STF filter is fabricated using thick film
hybrid technology and is sealed in a metal package for space,
military, aerospace and other applications requiring EMI suppres-
sion.
O
The SMSA power converter has an internal 2 µF ceramic
capacitor across its input power terminals. When the SMSA
and STF filters are used together, this capacitor becomes part
of the filter and forms its final LC output section. The STF filter
provides both differential and common mode rejection bringing
DC/DC converters into compliance with MIL-STD-461C CE03. It
is designed to be used with the SMSA, SMHF, and SLH Series
of converters. The STF filter can be used with multiple converters
up to the rated current of the filter. For more information, contact
your Interpoint representative.
peratiOn
Fully qualified to Class H or K
Passive components used for maximum tolerance in
space environments
-55°C to +125°C operation
Nominal 28 V input, 0 V to 50 V operation
Up to 0.8 A throughput current
55 dB attenuation typical at 500KHz
Compliant to MIL-STD-461C CE-03
Compatible with MIL-STD-704 A-E 28 VDC power bus
STF28-461 EMI Input Filters
28 VOlT INPuT – 0.8 aMP
Rev A - 20070509
Page 1 of 10
For SMHF and SLH converters a 4 µF (or greater) ceramic cap
is needed between the filter and converter to complete the last
inductive stage of this STF filter. This will ensure unconditional
stability when used with the SMHF or SLH. The SMSA does not
require this.
O
The optional damping circuit (Figure 2) can be used to prevent
filter overshoot caused by MIL-STD-704A 80 V, or other, tran-
sients having rise times of less than 200 µSec. This damping can
be alternately provided with a 1.50 V resistor in series with the
filter positive input where the additional line loss can be tolerated.
For transients with rise times of greater than 200 µSec, there is
no overshoot and the damping circuit is not required.
S
The STF28-461 filter offers three screening options: Space
Prototype (O), Class H, or Class K. Radiation tolerant to
Radiation Hardness Assurance (RHA) levels of “-” (O) or “H”,
per MIL-STD-38534. Interpoint model numbers use an “O” in
the RHA designator position to indicate the “-” (dash) Radiation
Hardness Assurance level of MIL-PRF-38534, which is defined
as “no RHA”. See “Class H and K, MIL-PRF-38534 Screening”
tables, for descriptions.
Creening
ptiOnal
D
amping
Crane Aerospace & Electronics Power Solutions
C
Input (V)
irCuit
28
i
nput
anD
C
V
urrent
Oltage
Current (A)
0.8

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stf28-461 Summary of contents

Page 1

... Compatible with MIL-STD-704 A-E 28 VDC power bus DESCRIPTION The STF28-461™ EMI filter module has been designed as a companion for Interpoint SMSA flyback power converters. Multiple SMSA power converters can be operated from a single filter provided the total power line current does not exceed the filter maximum rating. The STF filter will reduce the SMSA’ ...

Page 2

... Common The case ground connection between the filter and the converter should be as low an impe ance as possible to minimize EMI. Direct contact of baseplate to chassis ground provides the www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP meChaniCal and envirOnmental Size (maximum) 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm) See case A1 for dimensions ...

Page 3

... STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP pin OUt Pin Designation 1 Positive Input 2, 3 Positive Output 4 Case Ground 5, 6 Output Common 7 Input Common 8 Case Ground Squared corner and dot on top of cover indicate pin one BOTTOM 8 4 VIEW STF ...

Page 4

... Choose one from each of the following rows Screening * Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA” www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP / KH mOdel seleCtiOn 461 ...

Page 5

... VOltage input Current nOiSe reJeCtiOn DC reSiStanCe (r Output VOltage Output Current pOwer DiSSipatiOn at maXimum Current Notes: 1. Guaranteed by design, not tested. www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP COnDitiOnS min COntinuOuS 0 1 — 500 kHz MHz MHz ...

Page 6

... Typical Performance Curves: 25°C Tc, nominal Vin, unless otherwise specified. www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP NARROWBAND .015 0 FREQUENCY (MHz) MSA2805S converter without a filter igure NARROWBAND .015 0 FREQUENCY (MHz) MSA2805S converter at full load with an STF28-461 EMI filter. ...

Page 7

... STF28-461 EMI Input Filter Cases Projection Weld Seam Seal Seal hole: 0.056 ±0.002 (1.42 ±0.05) 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 CAUTION Heat from reflow or wave soldering may damage the device. ...

Page 8

... Not applicable to EMI filters that have no wirebonds. Definitions: Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534 SEM: Scanning Electron Microscopy SLAM™: Scanning Laser Acoustic Microscopy C-SAM Mode Scanning Acoustic Microscopy www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP K, MIl-PRF-38534 E s PaCE P o ...

Page 9

... Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Notes: 1. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534. 2. Not applicable to EMI filters that have no wirebonds. 3. Not required by DSCC but performed to assure product quality. www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP P RototyPE non 2 ...

Page 10

... STF EMI Input Filters, Rev A - 20070509. This revision supercedes all previous releases. 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. STF Series is a trademark of Interpoint. Copyright © 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com STF28-461 EMI Input Filters 28 VOlT INPuT – 0.8 aMP K, MIl-PRF-38534 R ...

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