Military Attenuator Module MI-RAM Actual size: 2.28 x 2.4 x 0.5in 57,9 x 61,0 x 12,7mm Ripple Attenuator Module Features & Benefits Packaging Options Standard: Slotted baseplate Reduces output PARD to 10mVp-p SlimMod: Flangeless baseplate, option suffix: - S Full attenuation up to 20A load Example: MI - RAM - M1 - S No adjustments required FinMod: Finned heat sink, option suffix: - F1, - F2, -F3 or -F4 Compatible with all MI-Family Examples: converters from 5 to 50V output DC MI - RAM - M1 -F1, 0.25 fins, longitudinal Efficiency: 93% 99% MI - RAM - M1 -F2, 0.50 fins, longitudinal MI - RAM - M1 -F3, 0.25 fins, transverse Converter sense, trim, OVP & OCP MI - RAM - M1 -F4, 0.50 fins, transverse retained MIL-STD-810 environments Electrical Considerations Size: 2.28 x 2.4 x 0.5 Transient Response and Dynamic Range: Full rated noise attenuation will be (57,9 x 61,0 x 12,7mm) maintained at the MI-RAM output for step load changes up to 10% of the rated output current of the source converter, with the MI-RAM exhibiting an underdamped Product Highlights output excursion of less than 10mVp-p. Some degradation in noise attenuation during the transient response period following the step may be exhibited for larger The MI-RAM is designed for applications where load changes. Adding output capacitance to the MI-RAM will improve the rejection extremely low noise outputs are required. over a larger dynamic range. When used with any Vicor MI-Family DC-DC Sense Connection: Sense-in and sense-out connections are provided on the MI-RAM. converter, the MI-RAM reduces both line Sense-in connections must be connected to the corresponding sense connections on frequency related ripple and switching noise to the Vicor converter. Sense-out pins on the MI-RAM must be connected between the less than or equal to 10mVp-p, DC to 20MHz. MI-RAM power-output pins, and the point of load. The combination of the MI-RAM with an Output Load Characteristics: When used in combination with Vicor DC-DC MI-Family converter provides the output noise converters, and with sense leads connected, the MI-RAM will be stable for any performance of a linear supply at a power 3 non-inductive load. density in excess of 15W/in . DC Voltage Drop: Below full load, the input to output DC Voltage Drop is controlled All of the features of the MI-Family converter to be an essentially constant voltage which appears between the IN and OUT remain available while using the MI-RAM, terminals. In overload the DC voltage drop will rise as current increases. A few tens including output voltage trimming, OVP and of millivolts appears between the +IN and +OUT terminals. Care should be taken not OTP (MI-200 only), current limiting, remote to connect IN and OUT terminals (i.e. through scope probe returns, grounds, etc.), as sense, and output inhibit. attenuation will be adversely affected. Full encapsulation in a low profile package enables the MI-RAM to meet MIL-STD-810 environmental testing requirements. Part Numbering MI - RAM - M - 2 Product Grade Temperatures (C) Current Rating Ripple Attenuator Grade Operating Storage Module 1 = Up to 10A I = - 40 to +100 - 55 to +125 2 = Up to 20A M = - 55 to +100 - 65 to +125 MI-RAM Rev 1.3 vicorpower.com Page 1 of 5 06/2017 800 927.9474MI-RAM Specifications (typical at T = 25C, nominal line and 75% load, unless otherwise specified) BP Parameter Min. Typ. Max. Units Notes 2.0 3.0 mVp-p MI-200 10% to 100% load Output noise and ripple 6.0 10.0 mVp-p MI-J00 10% to 100% load Input voltage range 5.0 50 V DC Output voltage accuracy 99.5 100.5 % Of MI source converter 10 A MI-RAM-I1 and MI-RAM-M1 Full load current 20 A MI-RAM-I2 and MI-RAM-M2 DC voltage drop 0.34 0.38 10% to full load Dissipation = (DC voltage drop x load current) + (V x 15mA) IN Isolation 250 V Input / output to baseplate RMS 3.6 3.7 3.8 ounces Weight 102 105 107 grams PRODUCT GRADE SPECIFICATIONS Parameter I-Grade M-Grade Storage temperature -55C to +125C -65C to +125C Operating temperature (baseplate) -40C to +100C -55C to +100C Power cycling burn-in 12 hours, 29 cycles 96 hours, 213 cycles Temperature cycled with power off 12 cycles 12 cycles 17C per minute rate of change -65C to +100C -65C to +100C a Test data supplied at these temperatures -40C, +80C -55C, +80C Warranty 2 years 2 years Environmental compliance MIL-STD-810 MIL-STD-810 Derating NAVMAT P-4855-1A NAVMAT P-4855-1A a Test data available for review or download from vicorpower.com ENVIRONMENTAL QUALIFICATIONS Parameter Qualification MIL-STD-810D, Method 500.2, Procedure III, explosive decompression (40K ft.). Altitude MIL-STD-810D, Method 500.2, Procedure II, 40,000ft., 1000 1500ft./min. to 70,000ft., unit functioning Explosive Atmosphere MIL-STD-810C, Method 511.1, Procedure I MIL-STD-810D, Method 514.3, Procedure I, category 6, helicopter, 20g 2 2 MIL-STD-810D, Method 514.3 random: 10 300Hz 0.02g /Hz, 2000Hz 0.002g /Hz, 3.9 total Grms Vibration 3hr s/axis. Sine: 30Hz 20g, 60Hz 10g, 90Hz 6.6g, 120Hz 5.0g, 16.0 total Grms, 3 axes MIL-STD-810E, Method 514.4, Table 514.4-VII, 6 db/octave, 7.7Grms, 1hr/axis MIL-STD-810D, Method 516.3, Procedure I, functional shock, 40g MIL-STD-202F, Method 213B, 18 pulses, 60g, 9msec Shock MIL-STD-202F, Method 213B, 75g, 11ms saw tooth shock MIL-STD-202F, Method 207A, 3 impacts / axis, 1, 3, 5 feet Acceleration MIL-STD-810D, Method 513.3, Procedure II Operational test, 9g for 1 minute along 3 mutually perpendicular axes Humidity MIL-STD-810D, Method 507.2, Procedure I, cycle I, 240 hrs, 88% relative humidity Solder Test MIL-STD-202, Method 208, 8hr. aging Fungus MIL-STD-810C, Method 508.1 Salt-Fog MIL-STD-810C, Method 509.1 MI-RAM Rev 1.3 vicorpower.com Page 2 of 5 06/2017 800 927.9474