TM
MI-RAM
Military COTS Ripple Attenuator Modules
Features
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ꢀ
ꢀ
Reduces output PARD to <10 mV pp
Full attenuation up to 20 A load
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ꢀ
93%-99% efficiency
Converter sense, trim, OV
and OC retained
Compatible with all MI-Series units
from 5 to 50 Vdc output
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ꢀ
MIL-STD-810 environments
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No adjustments required
Size: 2.28" x 2.4" x 0.5"
(57,9 x 61,0 x 12,7 mm)
Product Highlights
The MI-RAM is designed for
Specifications
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.
(At T = 25°C, unless otherwise specified)
BP
PARAMETER
MIN
TYP
MAX
UNITS
NOTES
Output noise and ripple
2.0
6.0
3.0
10.0
50
100.5
10
mV pp
mV pp
Vdc
%
A
A
MI-200; 10% to 100% load
MI-J00; 10% to 100% load
Input voltage range
Output voltage accuracy
Full load current
5Vdc
99.5
Of MI source converter
MI-RAM-I1 and MI-RAM-M1
MI-RAM-I2 and MI-RAM-M2
10% to full load
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 15 W/in3.
20
0.38
DC voltage drop
Dissipation = (DC voltage drop x load current) + (Vin x 15 mA)
Isolation
Weight
0.34
250
3.0 (85)
Vrms
ounces (grams)
Input/output to baseplate
All of the features of the MI-Series
converter remain available while
using the MI-RAM, including
Product Grade Specifications
output voltage trimming, OVP and
OTP (MI-200 only), current limiting,
remote sense, and output inhibit.
PARAMETER
PRODUCT GRADE
I-Grade
M-Grade
Storage temperature
-55°C to +125°C
-40°C to +100°C
12 hours, 25 cycles
-65°C to +125°C
-55°C to +100°C
Operating temperature (baseplate)
Power cycling burn-in
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.
96 hours, 200 cycles
Temperature cycled with power off
17°C per minute rate of change
12 cycles
12 cycles
-65°C to +100°C
-65°C to +100°C
Test data supplied at these temperatures*
Warranty
-40°C, +80°C
2 years
-55°C, +80°C
2 years
Environmental compliance
MIL-STD-810
MIL-STD-810
*
Test data available for review or download from vicorpower.com
Attenuation vs. Frequency (typical)
25 db
30 db
35 db
40 db
45 db
50 db
55 db
60 db
Mechanical Drawing
2.28
(57,9)
1.30
0.49
(33,0)
(12,4)
0.65
(16,5)
0.30±0.015
(7,6)±(0,38)
0.080 Dia (2) places
Solder plate
over copper alloy
Pin #
Function
+In
1
2
3
4
5
6
7
8
9
10 Hz
100 Hz
1 KHz
10 KHz
100 KHz
1 MHz
10 MHz
4
3
9
+Sense In
–Sense In
–In
Frequency
8
7
6
2.10
(53,4)
1.40
MI-RAM
(35,6)
1.00
(25,4)
+Out
0.70
(17,8)
2
1
Input to the converter
(10 V/cm)
Output from the RAM
(2 mV/cm)
0.40
(10,2)
+Sense
NC
5
0.35± 0.015
(8,9)±(0,38)
–Sense
–Out
0.15
(3,8)
0.040 (1,0) Dia (7) places
Solder plate
FULL R
0.15
(3,8)
over copper alloy
2.40
(61,0)
Product ID
this surface
0.30
1.90
(48,3)
1.75
(44,4) Max.
(7,6) Min.
0.22
(5,6) Min.
0.50
(12,7)
+0.030 (0,76)
-0.000 (0)
0.01
Aluminum Base
0.12
(3,0)
MI-RAM 6/05 1 of 1