Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module 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 MODEL FM-704A 40 Watts 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 Crane Aerospace & Electronics, Interpoint Corp. PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • [email protected] www.craneae.com The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI. Page 1 of 8 Rev B - 20060125 Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module OPERATING CONDITIONS AND CHARACTERISTICS 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 Input Voltage Range • 16 to 40 VDC continuous for 40 W load Lead Soldering Temperature (10 sec per pin) • 300°C Storage Temperature Range (Case) • –65°C to +150°C Case Operating Temperature (Tc) • –55°C to +125°C full power Derating Output Power/Current • Linearly from 40 W at 105°C to 25 W at 125°C to meet MIL-STD-1275A (AT) and MIL-STD-704A 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 MECHANICAL AND ENVIRONMENTAL Size (maximum) 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm) See case K1 for dimensions. Weight (maximum) 40 grams typical Screening Standard, ES, or 883 (Class H). See “QA Screening: /883 (Class H, QML)” for more information. 390 mH Positive Input 3.6 mH 3.6 mH Positive Output 3300 pF 500V 25 V 0.068 mF 3300 pF 6 mF Case 6600 pF 500V Oscillator Inhibit Input Common 6 mF Output Common 3300 pF / 500V 15 V FM-704A 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 www.craneae.com Page 2 of 8 Rev B - 20060125 Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module PINS NOT IN USE PIN OUT Pin 1 2 3 4 5 6 Designation Positive Input Positive Output Case Ground Output Common Input Common Inhibit Dot on top of package indicates pin one 1 6 2 BOTTOM VIEW FM-704A 5 4 See case K1 for dimensions. FIGURE 2: PIN OUT www.craneae.com 3 Page 3 of 8 Rev B - 20060125 Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module MODEL NUMBERING KEY FM - 704A / DSCC NUMBER 883 Base Model MIL-STD-704A Reference Screening (Standard screening has no designator in this position.) 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 “SMD/DSCC Lists” for more information. Model Selection FM Base model 704A MIL-STD-461 ref. case option Screening Choose one from each of the following rows Case option case K1 Screening standard screening, leave blank www.craneae.com Page 4 of 8 Rev B - 20060125 /ES (ES screening), /883 (Class H, QML) Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module 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. www.craneae.com Page 5 of 8 Rev B - 20060125 Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Transient Suppression Module Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified. 90 90 70 70 20 50 30 0 GAIN (dB) EMISSION LEVEL (dmA) EMISSION LEVEL (dmA) CE03 Limit 50 30 –20 –40 –60 10 10 -80 10 K 1M 100 K FREQUENCY (Hz) .015 0.1 1 10 50 1 .1 .015 10 50 FREQUENCY (MHz) FREQUENCY (MHz) 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 www.craneae.com Page 6 of 8 Rev B - 20060125 FM–704A Crane Aerospace & Electronics Power Solutions FM-704A EMI Input Filter and Trans. Suppression Module Cases www.craneae.com Page 7 of 8 Rev B - 20060125 Crane Aerospace & Electronics Power Solutions Quality Assurance 883, CLASS H, QML SCREENING TEST 125°C STANDARD non-QML 125°C /ES non-QML Class H /883 QML 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, 3000 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. FM704A EMI Input Filter. Rev B - 20060125. 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. SMFL Series is a trademark of Interpoint. 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