MI-RAM (MIL Ripple Attenuator Module)

Power Supply Filter which Reduce Output PARD to <10 mVpp for MIL Applications

Description

The MI-RAM is designed for applications where extremely low noise outputs are required. When used with any Vicor MI-series DC-DC converter, the MI-RAM reduces both line frequency related ripple and switching noise to less than 10 mV p-p, DC to 20 MHz. The combination of the MI-RAM with an MI-series converter provides the output noise performance of a linear supply at a power density in excess of 15 W/in3.

All of the features of the MI-series converter remain available while using the MI-RAM including output voltage trimming, OVP and OTP (MI-200 only), current limiting, remote sense, and logic enable / disable.

Fully encapsulated in a low profile package enables the MI-RAM to meet MIL-STD-810 environmental testing requirements.

Specifications

Input Voltage:
  • 5 – 50 Vdc
Output Current:
  • MI-RAM(x)1: 10 A
  • MI-RAM(x): 20 A
Efficiency:
  • 93 – 99%
Operation:
  • -55 – 100°C M-Grade
Dimensions(half brick):
  • 2.28″ x 2.4″ x 0.5″(57,9 x 61,0 x 12,7 mm)

Features

  • Reduces output PARD to <10 mV pp
  • Full attenuation up to 20 A load
  • Compatible with all MI-series units from 5 –50 Vdc output
  • No adjustments required
  • Converter sense, trim, OV and OC retained
  • MIL-STD-810 environments

Data Sheets

Application Notes

Design Guides / Manuals

Download Entire Manual

Download Individual Chapters

  1. Zero-Current Switching
  2. DC-DC Converter Pinouts
  3. Module Dos and Donts
  4. Overcurrent Protection
  5. Output Voltage Trimming
  6. Multiple Gate In Connections
  7. Applications Circuits / Converter Array Design Considerations
  8. Using Boosters and Parallel Arrays
  9. EMC Considerations
  10. Optional Output Filters
  11. Battery Charger (BatMod)

Filter and Front-End Module Chapters

  1. AC Input Module (AIM / MI-AIM)
  2. Harmonic Attenuator Module (HAM)
  3. Input Attenuator Module (IAM / MI-IAM)
  4. Ripple Attenuator Module (RAM / MI-RAM)
  5. Offline Front End

Power System Chapters

  1. DC Input Power System (ComPAC / MI-ComPAC Family)
  2. AC Input Power System (FlatPAC Family)
  3. AC Input Power System (PFC FlatPAC)

General Chapters

  1. Thermal and Module Mounting Considerations
  2. Thermal Curves
  3. Lead Free Pins (RoHS)
  4. Tin Lead Pins
  5. Module Packaging Options (SlimMod, FinMod, BusMod and MegaMod Families)
  6. Product Weights
  7. Glossary of Technical Terms

Mechanical Drawings

Drawing Number Description RoHS Technical Drawing
03550 Outline Drawing for MI-RAM Module PDF | DXF

Design Calculators

These calculator programs allow users to determine values that help with accessory component selection for power system design.

 

Thermal Calculator

BusMod

Terminal block for VI-J00-size modules
Description P/N RoHS Technical Drawing
Rugged chassis-mount housing for VI-J00-size module
(add-B1 suffix to module number for preinstalled)		 18952 PDF | DXF

EMI Shielding

Description P/N RoHS Technical Drawing
VI-J00-size Shield with Pem Nuts 32184 PDF | DXF

Sockets & Standoffs

Sockets
Description Pin Size P/N RoHS Technical Drawing
Electro-tin finish 0.040″ 30074 PDF | DXF
Electro-tin finish 0.080″ 30075 PDF | DXF
Standoffs
Description P/N RoHS Technical Drawing
Six 0.25″ x 0.525 Long Female, 0.25″ Hex 32183-01 PDF | DXF

Thermal Management

Heat sinks used with Vicor’s VI-J00-size module (not Mini modules)
Description P/N RoHS Technical Drawing
0.90″ Longitudinal Fins 30191 PDF | DXF
0.90″ Transverse Fins 30771 PDF | DXF
0.40″ Transverse Fins 30140 PDF | DXF
Heat Sink Thermal Data and Calculator
ThermMate Thermal Pads (10 pieces per package)
Description Thickness P/N RoHS Technical Drawing
For use with Vicor VI-J00 moduels only
(not Mini modules)		 0.007″ 20264 PDF | DXF
Grounding Clips
Description P/N RoHS Technical Drawing
For use with FinMod, Longitudinal 0.25″ Fins (-F1) 32185 PDF | DXF
For use with FinMod, Longitudinal 0.50″ Fins (-F2) 32185 PDF | DXF
For use with FinMod, Transverse 0.25″ Fins (-F3) 32186 PDF | DXF
For use with FinMod, Transverse 0.50″ Fins (-F4) 32186 PDF | DXF
For use with SlimMod Flangless package (-S) 32187 PDF | DXF