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FM704A Fiches technique(PDF) 1 Page - Sparkle Power Inc. |
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FM704A Fiches technique(HTML) 1 Page - Sparkle Power Inc. |
1 / 8 page FM-704A EMI Input Filter and Transient Suppression Module Crane Aerospace & Electronics Power Solutions Crane Aerospace & Electronics, Interpoint Corp. PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • electronics@craneae.com www.craneae.com Page 1 of 8 Rev B - 20060125 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 appli- cations. 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 gener- ated 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 base- plate 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 Refer to the Electrical Characteristics table on the following page 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. 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 high- side 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 over- shoot when the filter is initially powered or when it is released from the inhibit mode. An undervoltage lockout feature shuts off output power when input voltage falls below a specified level. Refer to Figure 8 for more infor- mation. LAYOUT REQUIREMENTS The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI. 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 |
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