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.
- 28 Vdc
- 155 Vdc
- 165 Vdc
- 270 Vdc
- 2 – 48 Vdc
- Up to 300 W
- 80 – 90%
- See mechanical drawing on data sheet
- Up to 13.5 W/in3
- One, two or three outputs
- MIL-STD-704D/E/F transient compliance for 28 and 270 Vdc
- MIL-STD-1399A compliance for 155 Vdc
- High efficiency
- Remote sense
- Environmental stress screening
- ZCS power architecture
- Low noise FM control
Download Individual Chapters
- Zero-Current Switching
- DC-DC Converter Pinouts
- Module Dos and Donts
- Overcurrent Protection
- Output Voltage Trimming
- Multiple Gate In Connections
- Applications Circuits / Converter Array Design Considerations
- Using Boosters and Parallel Arrays
- EMC Considerations
- Optional Output Filters
- Battery Charger (BatMod)
Filter and Front-End Module Chapters
- AC Input Module (AIM / MI-AIM)
- Harmonic Attenuator Module (HAM)
- Input Attenuator Module (IAM / MI-IAM)
- Ripple Attenuator Module (RAM / MI-RAM)
- Offline Front End
Power System Chapters
- DC Input Power System (ComPAC / MI-ComPAC Family)
- AC Input Power System (FlatPAC Family)
- AC Input Power System (PFC FlatPAC)
General Chapters
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. – Module temperature cycling 35°C to 80°C – Load up to 100 W – Module output continuously monitored while enabled |
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.
– MIL-STD-810D, Method 514.3 random: 10 – 300 Hz @ 0.02 g²/Hz, 2000 Hz @ 0.002 g²/Hz, 3.9 total g rms
3 hrs / axis Sine: 30 Hz @ 20 g, 60 Hz @ 10 g, 90 Hz @ 6.6 g, 120 Hz @ 5.0 g, 16.0 total g rms, 3 axes
– MIL-STD-810E, Method 514.4, Table 514.4-VII, ±6 db/octave, 7.7 g rms, 1hr/axis
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 | |
- 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.