VICOR MI-RAM-M1, MI-RAM-M2, MI-RAM-I2, MI-RAM-I1 Datasheet

Mechanical Drawing

5

6

7

8

9

4
3

2
1

0.080 Dia (2) places
Solder plate
over copper alloy

0.040 (1,0) Dia (7) places
Solder plate
over copper alloy

0.01
Aluminum Base

Product ID
this surface

Function

+In

–In

+Out

NC

–Sense

–Out

Pin #

1
2
3
4
5
6
7
8
9

FULL R

+0.030 (0,76)

-0.000 (0)

(5,6) Min.

(7,6) Min.

(44,4) Max.

2.40

2.28

0.12

0.50

1.90

0.65

(16,5)

0.49

(12,4)

0.30±0.015
(7,6)±(0,38)

0.15

2.10

(53,4)

1.30

0.40

(10,2)

0.35± 0.015
(8,9)±(0,38)

1.40

(35,6)

1.00

(25,4)

0.70

(17,8)

+Sense In
–Sense In

+Sense

MI-RAM

(57,9)

(33,0)

(3,8)

0.15

(3,8)

(48,3)

(3,0)

0.22

(12,7)

0.30

(61,0)

1.75

PARAMETER MIN TYP MAX UNITS NOTES

Output noise and ripple 2.0 3.0 mV pp MI-200; 10% to 100% load

6.0 10.0 mV pp MI-J00; 10% to 100% load
Input voltage range 5Vdc 50 Vdc
Output voltage accuracy 99.5 100.5 % Of MI source converter
Full load current 10 A MI-RAM-I1 and MI-RAM-M1

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) + (Vin x 15 mA)
Isolation 250 Vrms Input/output to baseplate
Weight 3.0 (85) ounces (grams)

Input to the converter

(10V/cm)

Output from the RAM

(2mV/cm)

60 db

55 db

25 db

30 db

35 db

40 db

45 db

50 db

10 MHz1 MHz100 KHz10 KHz1 KHz

100 Hz

10 Hz

Frequency

Attenuation

Attenuation vs. Frequency (typical)

Product Highlights

The MI-RAM is designed for
military 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
10mV p-p, DC to 20MHz.

The combination of the MI-RAM
with an MI converter provides the
output noise performance of a
linear supply at a power density
in excess of 15W/in

3

.

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 output inhibit.

All units are manufactured in ISO
9001-registered facilities. Full
epoxy encapsulation in a low
profile package enables the MI-RAM
to meet MIL-STD-810 environmental
testing requirements.

MI-RAM

TM

Military Ripple Attenuator Modules

" Reduces output PARD to <10mV pp

" Full attenuation up to 20A load

" Compatible with all MI-Series units

from 5 to 50Vdc output

" No adjustments required

" 93%-99% efficiency
" Converter sense, trim, OV

and OC retained

" MIL-STD-810 environments
" Size: 2.28" x 2.4" x 0.5"

(57,9 x 61,0 x 12,7mm)

Specifications

(At TBP= 25°C, unless otherwise specified)

Product Grade Specifications

Features

*

Test data available for review or download from vicorpower.com

PARAMETER PRODUCT GRADE

I-Grade M- Grade

Storage temperature -55°C to +125°C -65°C to +125°C
Operating temperature (baseplate) -40°C to +100°C -55°C to +100°C
Power cycling burn-in 12 hours, 25 cycles 96 hours, 200 cycles
Temperature cycled with power off 12 cycles 12 cycles

17°C per minute rate of change -65°C to +100°C -65°C to +100°C
Test data supplied at these temperatures* -40°C, +80°C -55°C,+80°C

Warranty 2 years 2 years
Environmental compliance MIL-STD-810 MIL-STD-810

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