FEATURES • –55°C to +125°C operation • 50 dB minimum attenuation at 500 kHz • Compliant to MIL-STD-461C, CE03 • Compatible with MIL-STD-704E DC power bus EMI INPUT FILTER 28 VOLT INPUT FMSA EMI FILTER 0.8 AMP MODEL FMSA-461 0.8 amp Size (max.): 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm) Case A1 Weight: 10.3 grams typical, 11.5 grams maximum Screening: Standard, ES, or 883 (Class H) DESCRIPTION The FMSA-461 EMI filter module has been designed as a companion for Interpoint MSA flyback power converters. Multiple MSA power converters can be operated from a single filter provided the total power line current does not exceed the filter maximum rating. The FMSA filter will reduce the MSA’s power line reflected ripple current to within the limit of MIL-STD-461C, Method CE03, as shown in the example of Figures 4 and 5. The FMSA is fabricated using thick film hybrid technology and is sealed in a metal package for military, aerospace and other applications requiring EMI suppression. The filter uses only ceramic capacitors for reliable high temperature operation. OPERATION The MSA power converter has an internal 2 µF capacitor across its input power terminals. When the MSA and FMSA filters are used together, this capacitor becomes part of the filter and forms its final LC output section. When 2 or 3 MSAs are used with a single filter, this capacitor becomes 4 µF or 6 µF respectively, rather than 2 µF, improving the rejection vs. frequency. The FMSA filter can also be used with other types of Interpoint power converters (MHF, MHF+, MHE, MHD, and DCH series) to comply with CE03. For MHF, MHF+, MHD, and MHE models, the converter has an LC type line filter such that an inductor is seen looking into its positive input terminal. For these converters, it is necessary to terminate the filter with a capacitor to insure unconditionally stable operation. A capacitor across the filter output terminals of greater than 4µF or the optional damping circuit shown on the connection diagram will be adequate for stable operation. No capacitor is required for MSA, or DCH models. OPTIONAL DAMPING CIRCUIT The optional damping circuit (Figure 2) can be used to prevent filter overshoot caused by MIL-STD-704A 80 V, or other, transients having rise times of less than 200 µSec. This damping can be alternately provided with a 1.50 Ω 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. LAYOUT REQUIREMENTS The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI. ® 1 EMI INPUT FILTERS FMSA EMI FILTER 0.8 AMP ABSOLUTE MAXIMUM RATINGS RECOMMENDED OPERATING CONDITIONS Input Voltage • 0 to 40 VDC continuous • 80 V for 100 ms transient Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C Input Voltage Range • 16 to 40 VDC continuous Case Operating Temperature (Tc) • –55°C to +125°C full power Derating Input/Output Current • Derate linearly from 100% at 100°C to 0.60 amps at 125°C case. Above 125°C derate to 0%. TYPICAL CHARACTERISTICS Capacitance • 0.045 µF max, any pin to case Isolation • 100 megohm minimum at 500 V • Any pin to case, except case pin Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified. PARAMETER INPUT VOLTAGE FMSA-461 TYP 28 — — — — MAX 40 80 0.80 — — UNITS VDC V A 200 kHz 500 kHZ TO 50 MHz MIN 0 — — 40 60 2 MHz - 50 MHz TC = 25°C 40 — — — — 1.2 dB Ω CONDITIONS CONTINUOUS TRANSIENT, 100 ms INPUT CURRENT DIFFERENTIAL MODE NOISE REJECTION COMMON MODE NOISE REJECTION DC RESISTANCE (RDC) dB VOUT = VIN - IIN (RDC) VDC OUTPUT VOLTAGE STEADY STATE OUTPUT CURRENT STEADY STATE (<100°C CASE) — — 0.80 A INTERNAL POWER DISSIPATION MAXIMUM CURRENT — — 0.96 W 0.65 ⍀ Positive Input 20 ⍀ 20 ⍀ Input Common >285 H 6 H 6 H 6800 pF 500 V 2 F 2 F Positive Output x2 0.014 F / 500 V x2 0.014 F / 500 V 6800 pF 500 V Output Common FMSA-461 0.014 F / 500 V 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. FIGURE 1: SCHEMATIC – TYPICAL VALUES ® 2 EMI INPUT FILTERS DC/DC Converter FMSA-461 Positive Input FMSA EMI FILTER 0.8 AMP Positive Output Positive Input Positive Output C Case Ground Input Common R Case Ground Input Common Output Common 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. RL Output Common Multiple units allowed up to rated output current. RL FIGURE 2: DAMPING CIRCUIT PIN OUT Pin 1 2, 3 4 5, 6 7 8 Designation Positive Input Positive Output Case Ground Output Common Input Common Case Ground Squared corner and dot on top of cover indicate pin one. 1 8 2 3 BOTTOM VIEW FMSA 7 4 6 5 See Section B8, case A1, for dimensions. FIGURE 3: PIN OUT DSCC NUMBER DSCC DRAWING (5915) 96003-01HXC MODEL NUMBERING KEY FMSA-461 FILTER SIMILAR PART FMSA-461/883 For exact specifications for a DSCC product, refer to the DSCC drawing. See Section A3, “SMD/DSCC Lists”, for more information. FMSA - 461 / 883 Base Model MIL-STD-461 Reference Screening (Standard screening has no designator in this position.) ® 3 FMSA EMI FILTER 0.8 AMP EMI INPUT FILTERS Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified. 90 80 CE A) 70 03 M 60 EMISSION LEVEL (dB NARROWBAND LI IT 50 40 30 20 10 0 .015 0.1 1 FREQUENCY (MHz) 10 50 MSA2805S converter without a filter. FIGURE 4 90 80 CE 03 A) 70 NARROWBAND LI M EMISSION LEVEL (dB 60 IT 50 40 30 20 10 0 .015 0.1 1 FREQUENCY (MHz) 10 50 MSA2805S converters at full load with an FMSA-461 EMI filter FIGURE 5 MAGNITUDE OF Zo (Ohms) 10.0 3.2 1.0 0.32 0.10 1K 2 µF external capacitor on filter output 10K 100K FREQUENCY (Hz) 1M Typical Output Impedance (Z) With Input Shorted FMSA-461 EMI Filter FIGURE 6 ® 4 EMI INPUT FILTERS FMSA EMI FILTER 0.8 AMP Dot on top of case indicates pin one. CASE A BOTTOM VIEW 0.805 max See cases A1 - A3 (20.45) for pin configurations. 0.980 max (24.89) Materials Header Kovar/Nickel/Gold (Case A3, Kovar/Nickel) 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 CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300 C for 10 seconds per pin. FIGURE 7: CASE A MAXIMUM DIMENSIONS BOTTOM VIEW CASE A1 FMSA EMI Filter and STF EMI Filter Projection Weld Seam Seal Squared corner and dot on top of case indicate pin one. 2 3 0.397 (10.08) 8 4 0.097 (2.46) 0.000 7 6 5 0.135 (3.43) 0.735 (18.67) 0.835 (21.21) 0.000 1 0.27 ±0.02 (6.9 ±0.5) 0.000 0.270 max (6.98) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.270 max (6.86) 0.697 (17.70 0.018 ± 0.002 dia. (0.46 ± 0.05) Seal hole: 0.056 ±0.002 (1.42 ±0.05) FIGURE 8: CASE A1 Please refer to the above written numerical dimensions for accuracy. ® 5 FMSA EMI FILTER 0.8 AMP EMI INPUT FILTERS QA SCREENING 125°C PRODUCTS 125°C PRODUCTS TEST (125°C Products) 125°C STANDARD 125°C /ES /883 (Class H)* Pre-cap Inspection Method 2017, 2032 yes yes yes Temperature Cycle (10 times) Method 1010, Cond. C, -65°C to 150°C, ambient Method 1010, Cond. B, -55°C to 125°C, ambient no no no yes yes no Constant Acceleration Method 2001, 300 g Method 2001, 500g no no no yes yes no Burn-In Method 1015, 160 hours at 125°C case, typical 96 hours at 125°C case, typical no no no yes yes no Final Electrical Test MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C case Subgroups 1 and 4: +25°C case no yes no yes yes no Hermeticity Test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no yes yes no Final Visual Inspection Method 2009 yes yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of –55°C to +125°C. 6 FMSA Rev B 20050522 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. FMSA Series is a trademark of Interpoint. Copyright © 1994 - 2005 Interpoint. All rights reserved. ®