MSF-461

MSF-461 INTERPOINT | Alldatasheet

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Technical content

DESCRIPTION

The MSF-461 EMI filter module has been specifically designed to reduce the input line reflected ripple current of Interpoint’s MSR and DCH Series of DC/DC converters. They are intended for use in applications where switch-mode DC/DC converters, operating at a frequency of higher than 50 kHz, must meet MIL-STD-461C levels of conducted power line noise. MSF-461 EMI filters are built using thick-film hybrid technology and are sealed in metal packages for military, aerospace, and other high-reliability applications. See Section B8, case C3, for dimen- sions. See Section C2 for screening options. MIL-STD NOISE MANAGEMENT When used in conjunction with Interpoint’s DC/DC converters (see connection diagram, Figure 2), the input ripple current will be reduced by 50 dB within the frequency band of 50 kHz to 50 MHz. This gives the filter/converter combination a performance which exceeds the CE03 test limit of MIL-STD-461C. The CE03 perform- ance of a model MSR2812D converter with and without the MSF- 461 filter is shown in Figures 4 and 5. FILTER OPERATION The MSF-461 filters are rated to operate, with no degradation of performance, over the temperature range of –55 ° C to +85 ° C (as measured at the baseplate). Above 85°C, input voltage and current must be derated as specified in “Derating” on the following page. The maximum power dissipation of 0.62 watts (at maximum input current) represents a power loss of less than 10% at typical input voltage. LAYOUT REQUIREMENTS The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI. EMI INPUT FILTER

28 VOLT INPUT

0.8 AMP

FEATURES

• –55°C to +85°C operation
• 50 dB minimum attenuation at 500 kHz
• Compliant to MIL-STD-461C, CE03
• Overvoltage protection See Section B8, cases C3, for dimensions. Weight: 15 grams typical, 16 grams maximum Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. MODEL MSF-461 0.8 amp

RECOMMENDED OPERATING CONDITIONS TYPICAL CHARACTERISTICSDERATINGABSOLUTE MAXIMUM RATINGS Input Voltage

• 0 to 40 VDC continuous Lead Soldering Temperature (10 sec per lead)
• 300°C Storage Temperature Range (Case)
• –55°C to +125°C B5-8 MSF EMI FILTER
• 0 to 40 VDC continuous Case Operating Temperature (Tc)
• –55°C to +85°C full power Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified. EMI INPUT FILTERS Capacitance
• 6600 pF max, any pin to case Isolation
• 100 megohm minimum at 500 V
• Any pin to case, except case pin 0.01 /H9262F 0.001/H9262F 100 /H9024 1000 pF□ 500 V Positive□ Input Input□ Common Positive□ Output Output□ Common MSF-461 570 /H9262H 50 /H9024 1000 pF□ 500 V 4.7 /H9262F FIGURE 1: SCHEMATIC MSF-461 PARAMETER CONDITIONS MIN TYP MAX UNITS INPUT VOLTAGE CONTINUOUS 0 28 40 VDC INPUT CLAMPING –55°C 38.9 43.2 47.5 VOLTAGE 25°C 42.3 47.0 51.7 VDC 85°C 44.9 49.9 54.8 INPUT CURRENT — — 420 mA DC NOISE REJECTION 50 — — dB DC RESISTANCE1 (RDC) TC = 25°C 3.00 3.20 3.50 Ω OUTPUT VOLTAGE2 STEADY STATE VOUT = VIN - IIN (RDC) VDC OUTPUT CURRENT STEADY STATE, 28 Vin — — 420 mA INTERNAL POWER DISSIPATION MAXIMUM CURRENT — — 0.62 W Notes 1. DC resistance measured using four wire technique. 2. Typical applications result in Vout within 5% of Vin. Input Voltage Derate linearly from 100% at 85°C case to the 33 VDC at 125°C case DC Input and Output Current Derate linearly from 100% at 85°C case to 150 mA at 125°C case.

Dot on top of cover □ indicates pin one. BOTTOM VIEW□ MSF 12 4 59 678 MSF - 461 / ES Base Model □MIL-STD-461 reference Screening (Standard screening has no designator□ in this position.) B5-9 MODEL NUMBERING KEY EMI INPUT FILTERS See Section B8, case C3, for dimensions. Pin Designation 1, 21 Input Common 3, 41 Positive Input 5, 61 Positive Output

7 Case Ground

8, 91 Output Common FIGURE 3: PIN OUT MSF EMI FILTER +Vin +Vout Input□ Common Output□ Common Case □ □ RL MSF-461 MSR CONVERTER +Vin +Vout Input□ Common Output□ Common Case □ 1, 2 3, 4 5, 6 1, 2 7 4 8, 9 17, 18 12, 13 8, 9 FIGURE 2: CONNECTION DIAGRAM Note 1. Make external connections to both pins.

Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified. EMI INPUT FILTERSMSF EMI FILTER 70□ .015□ .1□ 1 10 50 EMISSION LEVEL (dmA) FREQUENCY (MHz)□ CE03 Limit 70□ .015□ .1□ 1 10 50 EMISSION LEVEL (dmA) FREQUENCY (MHz)□ CE03 Limit FIGURE 4 FIGURE 5 Narrowband spectrum of an MSR2812D converter without an EMI filter. Narrowband spectrum of an MSR2812D converter with an MSF-461 filter on the input line. MSF Rev B 20060307 (output current correction). 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. Copyright © 1994 - 2006 Interpoint. All rights reserved.

85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES PRE-CAP INSPECTION Method 2017 yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C no yes CONSTANT ACCELERATION Method 2001, 500 g no yes BURN-IN 96 hours at 70°C ambient (typical) no yes FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case yes yes HERMETICITY TESTING Fine Leak, Method 1014, Cond. A no yes Gross Leak, Method 1014, Cond. C no yes Gross Leak, Dip (1 x 10-3) yes no FINAL VISUAL INSPECTION Method 2009 yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. MFW Series MTW Series MHE/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter 85°C PRODUCTS Applies to the following products: