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MI-MegaMods offer up to a total of 300 watts from one, two, or three outputs. Each unit incorporates one, two, or three component-level Vicor MI-200 / MI-J00 DC-DC converters in a chassis-mount package. Full-size Mega Modules use full-brick size MI-200 converters; half-size Mega Modules use half-brick-size MI-J00 converters. In addition, the MI-MegaMod chassis mount packaging can also be used on the MI-IAM, MI-RAM, and MI-AIM modules.
Standard features such as wide output trimming / programming, current limiting, remote sense, logic enable / disable combine to offer a high degree of protection, versatility, and reliability for power systems.
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Every MI Family module undergoes extensive post-production environmental stress screening (ESS) before shipment to verify compliance with Vicor's high quality and performance standards and to eliminate early life failures.
The current program of unpowered temperature cycling and dynamic power cycling burn-in is the result of years of test data analysis, process improvement, and screening strength calculations based on DOD-HDBK-344A, Hughes Model RADC-TR-86-149, and IES ESSEH Guidelines. To ensure the most effective routine for precipitating module failures, Vicor continually evaluates its ESS program and makes appropriate changes as new data become available or as product improvements occur. After burn-in and temperature cycling, each module undergoes final electrical testing over the specified temperature range. The program is outlined below.
| MI-Family Module Screening | I-Grade | M-Grade | ||||
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| Operating Temperature | Mi-200 | -40°C to +85°C | -55°C to +85°C | |||
| Mi-J00 | -40°C to +100°C | -55°C to +100°C | ||||
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| Storage Temperature | Mi-200 | -55°C to +100°C | -65°C to +100°C | |||
| Mi-J00 | -55°C to +125°C | -65°C to +125°C | ||||
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| Temperature Cycling | ||||||
| 17°C per minute nominal rate of change, dwell time until product stabilization. | 12 cycles -65°C to +100°C | 12 cycles -65°C to +100°C | ||||
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| Ambient Test @ 25°C | Yes | Yes | ||||
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| Power Cycling Burn-In | ||||||
| - Power on 10 min., off 15 min. | 12 hours, 29 cycles | 96 hours, 213 cycles | ||||
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| Functional and Parametric ATE Tests | ||||||
| Low & high temp. | -40°C to +85°C | -55°C to +85°C | ||||
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| AC Hi-Pot Test | Yes | Yes | ||||
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| Visual Inspection | ||||||
| Before packing into ESD containers | Yes | Yes | ||||
Fully encapsulated, Vicor's MI-Family modules utilize a proprietary spin fill process that assures complete, void free encapsulation making them suitable for the most harsh environments. In addition to providing mechanical rigidity,the encapsulant is thermally conductive to eliminate hot spots and aid in heat transfer to the baseplate. Two grades, I & M, are available with temperatures to -55°C operating and -65°C storage.
To verify the suitability of Vicor's MI Family products for harsh environments, MI-Family modules have been subjected to the environmental testing requirements of MIL-STD-810 and MIL-STD-202. These tests, listed below, are performed at an independent laboratory. Additional environmental tests can be done upon individual customer request. Some of those performed for specific customer applications include ESD (DOD-HDBK-263), Structure Borne (Acoustic) Noise, Transportation Vibration, Flammability, Terminal Strength, Thermal Shock, and Power Conditioning. Contact the factory for details.
Because operating temperature is one of the most important factors in determining overall module reliability, it is imperative that the user's system design allow for efficient heat transfer from the baseplate to system ambient. Since temperature and failure rate are exponentially related, just a 10°C decrease in baseplate temperature can have a dramatic increase in MTBF. Due to patented zero-voltage/zero-current switching topology, Vicor converters are highly efficient compared to those with more traditional topologies. High efficiency translates into both smaller size and lower temperature rises. To minimize thermal impedance, all major power dissipating components are mounted directly to the baseplate.
Below are representative calculated MTBF values based on MIL-HDBK-217F. If you require information about a specific model, contact Vicor with the model number, expected baseplate temperature, and operating environment to obtain an individually prepared report.
| Model Number | Baseplate Temperature | MTBF in 1,000 Hrs. | |||
| G.B | G.F. | A.I.C. | N.S. | ||
| MI-J71-MY | 25°C | 3,778 | 1,894 | 1,136 | 1,117 |
| 50°C | 2,311 | 1,155 | 693 | 682 | |
| 65°C | 1,780 | 890 | 534 | 525 | |
| MI-276-MW | 25°C | 3,755 | 1,878 | 1,127 | 1,108 |
| 50°C | 2,291 | 1,145 | 687 | 678 | |
| 65°C | 1,765 | 882 | 529 | 521 | |
PowerBench™– MegaMod / MI-MegaMod Product Configurator »
With this configurator you can select input voltage, output voltages, power levels, temperature grades and then a part number, price, and delivery date will be displayed.
MI-IAM – Input Attenuator Module - DC Input, front-end modules providing transient protection, inrush current limiting and EMI filtering for MI-200 and MI-J00 DC-DC converters.
MI-RAM – Ripple Attenuator Module - MI-RAM may be connected to MI-200 or MI-J00 converters with output voltages from 5 – 50 Volts, to limit total output noise to less than 3 mV peak-to-peak at loads up to 20 Amps.
MicroRAM – Ripple Attenuator Module - The MicroRAM combines both active and passive filtering to achieve greater than 40 dB of noise attenuation from over a range of 3 – 30 Vdc.
MI-AIM – AC Input Front-End Module - The MI-AIM is an AC front-end module which interfaces directly with AC mains to provide line rectification, EMI fltering, transient protection, and inrush lmiting.
MIL-COTS Maxi, Mini and Micro DC-DC Converters - Our Maxi, Mini and Micro models (full, half, quarter-brick) DC-DC converters feature a patented low noise design with the highest reliability and power density available.
MI-200 / MI-J00 DC-DC Converters - The MI-series is designed for MIL-COTS applications utilizing distributed power architecture and is based on Vicor's zero-current switching, component level DC-DC converters.
MIL-COTS VIPAC Array – Chassis Mount DC-DC Converter - VIPAC Arrays are a highly flexible 24 and 300 Vdc inut power system that can be configured with as many as four user-definable outputs, with power capability, up to 750 W.
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