380
MEDICAL & MILITARY
MI-RAM Series
MILITARY COTS OUTPUT RIPPLE ATTENUATOR MODULES
Features
• Compatible with all MI- series modules
• Military Specification Compliance
• Environments: MIL-STD-810
• Efficiency 93-99%
• Operating Temperature to 100°C
• No adjustment required
• Reduces output PARD to < 10mVp-p
• Full attenuation up to 20A load
Electrical Considerations
TRANSIENT RESPONSE AND DYNAMIC RANGE:
Full rated noise attenuation will be maintained at the MI-RAM output for step
load changes up to 10% of the rated output current of the source converter,
with the MI—RAM exhibiting an underdamped output excursion of less than
10mV pp. Some degradation in noise attenuation during the transient response
period following the step may be exhibited for larger load changes. Adding
output capacitance to the MI-RAM will increase the dynamic rejection range.
SENSE CONNECTION:
Both sense-in and sense-out connections are provided on the MI-RAM. Sense-
in connections must be connected to the corresponding sense connections on
the Vicor converter from which the MI-RAM is powered. Sense-out pins on the
MI-RAM must be connected either directly to the MI-RAM power-output pins, or
at the point of load.
OUTPUT LOAD CHARACTERISTICS:
When used in combinations with Vicor DC-DC converters, and with sense leads
connected, the MI-RAM will be stable for any non-inductive load.
Specifications
INPUT
Input Voltage Range 5Vdc to 50Vdc
DC Voltage Drop 0.34 to 0.38 No load to full load
OUTPUT
Efficiency 93 to 99%
Output Noise & Ripple MI-200: 2mVp-p typical
MI-J00: 6mV p-p typical
10%-100% load
10%-100% load
Output Voltage Accuracy 99.5% to 100.5%
DC Voltage Drop 0.34 to 0.38 No load to full load
Full Load Current MI-RAM-I1: 10A
MI-RAM-M1: 10A
MI-RAM-I2: 20A
MI-RAM-M2: 20A
OPERATING
Isolation Characteristics Input / Output / Base 250V rms
ENVIRONMENTAL
Part number MI-RAM-I2 MI-RAM-M2
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 12hrs 25 cycles 96hrs 200 cycles
Temperature Cycling
48 hrs, 12cycles
-65°C to +100°C
48hrs, 12cycles
-65°C to +105°C
Test Data Supplied at these
Temperatures
-40°C, +80°C -55°C, +80°C
Derating NAVMATP-4855-1A
STANDARDS AND APPROVALS
Spikes ±50% nom line voltage per MIL-STD-6051 50ms
Conducted EMI CE102 per MIL-STD-461D
Environmental (MIL-STD-810D)
Altitude – Method 500.2 40,000 ft
Humidity - Method 507.2 86,240 % hours
Acceleration – Method
513.3
9 g’s
Vibration – Method 514.3 20 g’s
Shock – Method 516.3 40 g’s
Reliability (MIL-HDBK-217E)
25°C Ground Benign 885,917 hours
50°C Naval Sheltered 87,068 hours
65°C Airborne inhabited
cargo
49,153 hours
MECHANICAL
Weight 85 grams
Dimensions 57.9 x 61 x 12.7mm
