RAM™
Ripple Attenuator Module

RAM.jpg

Description

Ripple attenuator modules may be connected to VI-200 or VI-J00 converters, FlatPACs, ComPACs, or MegaMods, 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. Combining active and passive filtering, the RAM attenuates both low frequency input power source harmonics and high frequency switching components in the frequency range of DC to 20 MHz, while exhibiting efficiencies of 93 – 99%. No adjustments are required, and remote sense and output voltage trim features are retained.

The RAM offers power systems architects a single, flexible, component-level solution to almost any clean power problem. It also eliminates the space, efficiency, and weight penalties associated with linear power sources, and the stability, efficiency, and adjustment penalties associated with external add on filters for conventional switchers.

Specifications
Input Voltages   5 – 50 VDC
Input Current   Up to 20 A
Efficiency   93 – 99%
Dimensions   2.28 x 2.40 x 0.50 in
57.9 x 61.0 x 12.7 mm
   

 

 

PDF Icon Family Overview »

 

Find

Compatible Converters

The RAM – Ripple Attenuator Module – works in conjunction with a specific set of Vicor converters to deliver optimal efficiency, power and protection.
 
To easily view the appropriate converter components needed for the desired RAM, please use the PowerBench Solution Selector tool to locate compatible offerings.

Use the matrix below to select a module to meet your needs. You can click on the filter icons at the top of each column to filter results. Click on the column heading to sort the column. Once you have made your selection click on the add to cart option to purchase prototype quantities.

  

Part Number
Filter Column
Product Grade
Filter Column
Power
Filter Column
RoHS Compliant

Purchase Online
VE-RAM-C1 –25°C to +100°C Up to 10 Amps Yes Add to Cart »
VE-RAM-C2 –25°C to +100°C Up to 20 Amps Yes Add to Cart »
VE-RAM-E1 –10°C to +100°C Up to 10 Amps Yes Add to Cart »
VE-RAM-E2 –10°C to +100°C Up to 20 Amps Yes Add to Cart »
VE-RAM-I1 –40°C to +100°C Up to 10 Amps Yes Add to Cart »
VE-RAM-I2 –40°C to +100°C Up to 20 Amps Yes Add to Cart »
VE-RAM-M1 –55°C to +100°C Up to 10 Amps Yes Add to Cart »
VE-RAM-M2 –55°C to +100°C Up to 20 Amps Yes Add to Cart »
VI-RAM-C1 –25°C to +100°C Up to 10 Amps No Add to Cart »
VI-RAM-C2 –25°C to +100°C Up to 20 Amps No Add to Cart »
VI-RAM-E1 –10°C to +100°C Up to 10 Amps No Add to Cart »
VI-RAM-E2 –10°C to +100°C Up to 20 Amps No Add to Cart »
VI-RAM-I1 –40°C to +100°C Up to 10 Amps No Add to Cart »
VI-RAM-I2 –40°C to +100°C Up to 20 Amps No Add to Cart »
VI-RAM-M1 –55°C to +100°C Up to 10 Amps No Add to Cart »
VI-RAM-M2 –55°C to +100°C Up to 20 Amps No Add to Cart »
1     16 products
Features & Benefits
  • Reduces output ripple to <3 mV pp (VI-200)
  • Compatible with any VI-200 / VI-J00 based product with a 5 - 50 Vdc output
  • No adjustments required
  • Converter sense, trim, overvoltage and overcurrent retained
Diagram
ram-block-diagram.jpg

The output of the converter feeds directly into a high frequency passive filter that attenuates switching noise. Low frequency, line related ripple attenuation is via a FET series regulator that maintains a constant average forward voltage drop of about 350 mV. The FET gate is modulated to maintain the AC component of the FET drain-source voltage equal to the ripple component of the incoming DC voltage, effectively cancelling it out. The power supply's sense leads feed through the RAM for connection at the RAM output for local sense or at the load for remote sense.

 

Packaging Options

2-D Half-Size VI-J00 / VE-J00 Module (referring to drawing number 03550)

DXFOutline Drawing for half-size VI-J00 / VE-J00 DC-DC converter »

PDFOutline Drawing for half-size VI-J00 / VE-J00 DC-DC converter »

 

3-D Half-Size VI-J00 / VE-J00 Module (referring to drawing number 03550)

STEPNon-RoHS, VI-J00 series »

3D PDFNon-RoHS, VI-J00 series »

STEPRoHS, VI-J00 series »

3D PDFRoHS, VI-J00 series »

Related Products

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DC-DC    

 

 

Converters    
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VI-200, VI-J00   Go  
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Filters    
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MicroRAM – Output Ripple Attenuator Module   Go  

 

 

Accessories

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BusMods

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Terminal blocks listed in the table below are for use with Vicor VI-J00 size modules.
These terminal blocks are NOT for use with Vicor Mini-size modules.
Terminal
Blocks
  Part
Number
  RoHS
Compliant
  Module
Style
                  Technical Drawing    
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Rugged chassis-mount housing   18952   Yes   VI-J00   Add-B1 suffix to module number for preinstalled   PDF   Add to Cart  
          DXF  

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EMI Shielding

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VI-J00-Size Shield   Part
Number
  RoHS
Compliant
  Module Style        
 
   
 
   
 
  Technical Drawing    
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With Pem Nuts   32184   Yes   VI-J00                   PDF   Add to Cart  
                      DXF  

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Sockets

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Electro-tin Finish   Part
Number
  Vendor
Part Numbers
  RoHS
Compliant
                  Technical Drawing    
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0.040"   30074   09-9002-1-04   Yes                   PDF   Add to Cart  
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0.080"   30075   09-9044-1-04   Yes                   PDF   Add to Cart  

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Standoffs

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Long Female
0.25" Hex
  Part
Number
  RoHS
Compliant
                      Technical Drawing    
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(6) 0.25" x 0.525"   32183-01   Yes                       PDF   Add to Cart  
                        DXF  

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Thermal Management

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Heat Sinks listed in the table below are for use with Vicor VI-J00-size modules.
These heat sinks are NOT for use with Vicor Mini-size modules.
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TOOLHeat Sink Thermal Data and Calculator »
 

Heat Sinks
Longitudinal Fins

  Part
Number
  RoHS
Compliant
  Module Style                   Technical Drawing    
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0.90"   30191   Yes   VI-J00                   PDF   Add to Cart  
                      DXF  
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Heat Sinks listed in the table below are for use with Vicor VI-J00-size modules.
These heat sinks are NOT for use with Vicor Mini-size modules.
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TOOLHeat Sink Thermal Data and Calculator »
 
Heat Sinks
Transverse Fins
  Part
Number
  RoHS
Compliant
  Module Style                   Technical Drawing    
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0.90"   30771   Yes   VI-J00                   PDF   Add to Cart  
                      DXF  
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0.40"   30140   Yes   VI-J00                   PDF   Add to Cart  
                      DXF  

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Thermal Pads listed in the table below are for use with Vicor VI-J00-size modules.
These Thermal Pads are NOT for use with Vicor Mini-size modules.
ThermMate
Thermal Pads
  Part
Number
  RoHS
Compliant
  Module Style                   Technical Drawing    
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(10) 0.007" Pads   20267   Yes   VI-J00                   PDF   Add to Cart  
                      DXF  

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Grounding Clips   Part
Number
  RoHS
Compliant
                      Technical Drawing    
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For use with
FinMod Longitudinal
0.25" Fins (-F1)
  32185   Yes                       PDF   Add to Cart  
                      DXF  
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For use with
FinMod Longitudinal
0.50" Fins (-F2)
  32185   Yes                       PDF   Add to Cart  
                      DXF  
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For use with
FinMod Transverse
0.25" Fins (-F3)
  32186   Yes                       PDF   Add to Cart  
                      DXF  
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For use with
FinMod Transverse
0.50" Fins (-F4)
  32186   Yes                       PDF   Add to Cart  
                      DXF  
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For use with
SlimMod Flangless Package (-S)
  32187   Yes                       PDF   Add to Cart  
                      DXF  

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