FEATURES • –55°C to +125°C operation • 16 to 40 VDC input • Up to 60 dB attenuation at 500 kHz. • Active transient suppression • Undervoltage lockout • Inhibit function • Compliant to MIL-STD-461C, CE03 EMI INPUT FILTER AND TRANSIENT SUPPRESSION MODULE, 28 VOLT INPUT FM-704A EMI FILTER 40 WATT MODEL FM-704A 40 Watts Size (max): 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm) See Section B8, case K1, for dimensions. Weight: 40 grams maximum Screening: Standard, ES, or 883 (Class H). See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION Interpoint’s 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 Figures and Electrical Characteristics table). 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 25 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-461B&C British Standard BS3G100 MIL-STD-1275 Civil Aircraft D0160B 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 highside 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. Refer to the Electrical Characteristics table on the following page for more information. An undervoltage lockout feature shuts off output power when input voltage falls below a specified level. Refer to Figure 8 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. LAYOUT REQUIREMENTS The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI. B3-3 FM-704A EMI FILTER 40 WATT EMI INPUT FILTERS ABSOLUTE MAXIMUM RATINGS Input Voltage • 16 to 40 VDC continuous for 40 W load Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C TYPICAL CHARACTERISTICS INHIBIT Inhibit TTL Open Collector • Logic low (output disabled) Logic low voltage ≤0.8 V Logic low inhibit pin current 0.6 mA max • Referenced to input common • Logic high (output enabled) Open collector Capacitance • 0.017 µF max, any pin to case Undervoltage lockout • 7 VDC min, 15 VDC max Isolation • 100 megohm minimum at 500 V • Any pin to case, except case pin Inhibit Pin Voltage (unit enabled) • 5.5 V max RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 40 VDC continuous for 40 W load Case Operating Temperature (Tc) • –55°C to +125°C Derating Output Power • Linearly from 40 W at 105°C to 25 W at 125°C to meet MIL-STD-1275A (AT) and MIL-STD-704A Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified. PARAMETER INPUT VOLTAGE FM-704A TYP 28 28 — — CONDITIONS NO LOAD 40 W LOAD UNDERVOLTAGE LOCKOUT 16 VIN 40 VIN NO LOAD INHIBITED 40 W, 100 V, 0.5 Ω ZS, 60 ms1 MIN 0 16 7 — — — — — 42 — — — MAX 40 40 15 2.5 1.0 5 2 48 INPUT SPIKE 40 W, 400 V, 0.5 Ω ZS, 5 µs2 — — 48 DIFFERENTIAL MODE NOISE REJECTION DC RESISTANCE (RDC) 40 W, 600 V, 50 Ω ZS, 10 µs3 500 kHz 1 MHz Tc = 25°C — 60 55 — — — — — 48 — — 0.45 INPUT CURRENT INPUT SURGE OUTPUT VOLTAGE OUTPUT CURRENT INTERNAL POWER DISSIPATION VOUT = VIN - IIN (RDC) STEADY STATE INHIBITED 16 VIN 40 VIN PEAK 105°C 125°C CONTINUOUS ( > 10 SEC.) 105°C 125°C UNITS VDC A mA VOUT V OUT dB Ω VDC — — — — — — 1 2.5 1.0 — — — — 1000 500 — — — — 30 15 A W Notes 1. Meets MIL-STD-1275A (AT) Surge and Figure 8 and 9 of MIL-STD-704A. For these standards derate output power linearly from 40 W at 105°C to 25 W at 125°C. 2. Meets Panavia SP-P-90001, British Standard BS3G100 and Civil Aircraft D0160 Standards. 3. Meets MIL-STD-461C 1.2 CS06 limits. B3-4 FM-704A EMI FILTER 40 WATT EMI INPUT FILTERS 390 mH Positive Input 3.6 mH 3.6 mH 3300 pF 500V 25 V 6 mF 6 mF 0.068 mF 3300 pF Case 6600 pF 500V Oscillator Inhibit Input Common Positive Output Output Common 3300 pF / 500V FM-704A 15 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 PIN OUT Dot on top of package indicates pin one Pin 1 2 3 4 5 6 Designation Positive Input Positive Output Case Ground Output Common Input Common Inhibit 1 6 2 BOTTOM VIEW FM-704A 5 3 4 See Section B8, case K1 for dimensions. FIGURE 2: PIN OUT DSCC NUMBER DSCC DRAWING (5915) FM-704A FILTER SIMILAR PART 94028-01HXC FM-704A/883 For exact specifications for a DSCC product, refer to the DSCC drawing. See Section A3, “SMD/DSCC Lists”, for more information. MODEL NUMBERING KEY FM - 704A / 883 Base Model MIL-STD-704A Reference Screening (Standard screening has no designator in this position.) B3-5 FM-704A EMI FILTER 40 WATT EMI INPUT FILTERS Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified. 90 90 70 70 50 30 20 0 50 GAIN (dB) EMISSION LEVEL (dmA) EMISSION LEVEL (dmA) CE03 Limit 30 10 10 –20 –40 –60 -80 .015 0.1 1 10 .015 50 .1 1 10 10 K 50 1M 100 K FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (Hz) MHF+ Converter With FM-704A Filter Differential Mode Response FIGURE 3 FIGURE 4 FIGURE 5 10.00 Vin andVout 1.00 5 V/ div. 1 A / div. IMPEDANCE (Z, OHMS) MHF+ Converter Without Filter Vin 0.10 Vout 0 volts for Vout 0.01 5 ms / div. 1K FM–704A 100 K 10 K 1M 100 ms / div. FREQUENCY (Hz) 15 watt load Inrush Current Typical Output Impedance (Z) With Input Shorted FIGURE 7 FIGURE 6 Undervoltage Lockout FIGURE 8 WATTS 1000 100 10 0.1 1 10 100 1000 TIME (ms) Derate power linearly to 50% at 125°C. Operation below this curve ensures a maximum junction temperature rise of 40°C or less. Maximum Allowed Internal Power Dissipation 105°C case temperature FIGURE 9 B3-6 25021-001-DTS Rev A DQ# 4001 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. FM-704A is a trademark of Interpoint. Copyright © 1992 - 1999 Interpoint. All rights reserved. FM–704A CASE K CASES Dot on top of case indicates pin one CASE K BOTTOM VIEW See Figures 42 - 48 for pin configuration 1.125 max (28.58) 2.910 max (73.91) Flange Thickness: Cases K1, K2, K3 and MLP Series (K5) 0.060 (1.52) Cases K4, K5 (except MLP Series), K6, K7, and K8 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) Materials Header Case K1 - K3 Cold Rolled Steel/Nickel/Gold Cases K4 - K8 Cold Rolled Steel/Nickel/Tin Cover Case K1 - K3 Kovar/Nickel Case K4 - K8 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) Case K1, K2, and K3 (except MHV Series Single and Dual) ceramic seal Cases K4 - K8 and MHV Series Single and Dual (K3) compression glass seal Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.2) 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 41: CASE K MAXIMUM DIMENSIONS B8-26 CASES CASE K BOTTOM VIEW CASE K1 Flanged case FM-704A EMI Filter: Screening – Standard, ES, or 883 Seam Seal 0.040 dia (1.02) Dot on top of case indicates pin one 1.110 (28.19) 0.955 (24.26) 1 2 6 3 5 4 0.162 dia (4.11) 0.555 (14.1) 0.155 (3.94) 2.320 (58.93) 1.845 (46.86) 0.245 (6.22) 0.000 0.230 (5.84) 0.25 ±0.03 (6.4 ±0.8) 0.000 0.400 max. (10.16) 0.000 FIGURE 42: CASE K1 BOTTOM VIEW CASE K2 Flanged cases: Designator required in Case Option position of model number. FMC EMI Filter: Screening – Standard, ES, or 883 SFMC EMI Filter: Screening – Space Standard, H, or K Seam Seal 0.040 dia (1.02) Dot on top of case indicates pin one 1.110 (28.19) 0.955 (24.26) 1 2 0.162 dia (4.11) 3 0.555 (14.1) 5 4 0.155 (3.94) 2.320 (58.93) 2.090 (53.01) 1.845 (46.86) 0.245 (6.22) 0.000 0.230 (5.84) 0.25 ±0.03 (6.4 ±0.8) 0.000 0.400 max. (10.16) 0.000 FIGURE 43: CASE K2 B8-27 QA SCREENING 125°C PRODUCTS 125°C PRODUCTS TEST (125°C Products) STANDARD /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 Method 1010, Cond. B, -55°C to 125°C no no no yes yes no CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g no no no yes yes no BURN-IN Method 1015, 160 hours at 125°C 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 Subgroups 1 and 4: +25°C case no yes no yes yes no HERMETICITY TESTING 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. Applies to the following products MOR Series MHD Series MFLHP Series MHV Series MFL Series MHF+ Series MHP Series MHF Series** MTR Series MGA Series MQO Series** MSA Series MGH Series MCH Series FM-704A EMI Filter FMD**/FME EMI Filter FMC EMI Filter FMH EMI Filter FMGA EMI Filter FMSA EMI Filter HUM Modules** LCM Modules** LIM Modules **MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer ‘883” screening. C2-10