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SFCS28-461 Datasheet(PDF) 1 Page - Crane Aerospace & Electronics. |
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SFCS28-461 Datasheet(HTML) 1 Page - Crane Aerospace & Electronics. |
1 / 9 page description The SFCS-461TM Series EMI Filter modules are specifically designed to reduce the reflected input ripple current of high frequency DC/DC converters. SFCS28-461 filters minimize elec- tromagnetic interference (EMI) for Interpoint’s space application converters. These filters are intended for use in 28 volt applica- tions which must meet MIL-STD-461 levels of conducted emis- sions. One filter can be used with multiple converters up to the rated throughput current of the filter. Screening The SFCS28-461 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 more information. input ripple and eMi Switching DC/DC converters naturally generate two noise components on the power input line: differential noise and common mode noise. Input ripple current refers to both of these components. Differential noise occurs between the positive input and input common. Most Interpoint converters have an input filter that reduces differential noise which is sufficient for most applications. Common mode noise occurs across stray capacitance between the converter’s power train components and the baseplate (bottom of the package) of the converter. Where low noise currents are required to meet CE03 of MIL- STD-461C, a power line filter is needed. The SFCS28-461 Series of EMI power line filters reduces the common mode and differ- ential noise generated by the converters. SFCS28-461 filters reduce input ripple current by at least 60 dB at 500 kHz, 1 MHz, and 5 MHz when used in conjunction with Interpoint’s DC/DC converters. The filter must be placed as close as possible to the converter for optimum performance. the baseplates of the filter and the converter should be connected with the shortest and widest possible conductors. For the best connection, mount the filter’s and converter’s baseplates on or above a small ground plane. OperatiOn and teMperature All SFCS28-461 Series filters are rated for full power opera- tion from -55˚C to +125˚C case temperature. Current is derated linearly to zero at +135˚C case temperature. inSertiOn lOSS The maximum DC insertion loss at full load and nominal input voltage represents a power loss of less than 4%. packaging SFCS28-461 filters are sealed in metal hermetic side-leaded packages. For more information contact your Interpoint represen- tative. Features • 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 5 A throughput current • 70 dB attenuation typical at 500KHz • Compliant to MIL-STD-461C CE-03 • Compatible with MIL-STD-704 A-E 28 VDC power bus Input Voltage and Current Model SFCS28-461 Current (A) 5 Crane Aerospace & Electronics Power Solutions sFcs28-461 eMi input Filters Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • electronics@craneae.com www.craneae.com Page 1 of 9 Rev B - 20070404 28 Volt input – 5 aMp |
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