VICOR VI-RAM-M1, VI-RAM-I2, VI-RAM-I1, VI-RAM-E2, VI-RAM-E1 Datasheet

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12
1-800-735-6200
VI-RAM™
Ripple Attenuator Modules
Features
Reduces Output Ripple to <3 mV pp
Compatible with any VI-200/VI-J00-
based Product: 5 to 50Vdc Output
Full Attenuation Up to 20A
93-99% Efficiency
Converter Sense, Trim, Overvoltage
and Overcurrent Retained
Size: 2.28" x 2.4" x 0.5"
(57,9 x 61,0 x 12,7)
CE Marked
Product Highlights
Ripple attenuator modules may be connected to VI-200 or VI-J00 converters, FlatPACs, MegaPACs, MasterModules or MegaModules, with output voltages from 5 to 50V, to limit output noise to less than 3mV peak-to-peak at loads up to 20A. Combining active and passive filtering, the VI-RAM attenuates both low frequency input power source fundamental and 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.
A member of Vicor’s high-power density, high performance, component-level power building blocks, the VI-RAM offers the power systems architect a single, flexible, component-level solution to almost any “clean power” problem. At the same time, the VI-RAM 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.
VI-RAM Specifications
(typical at TBP= 25°C, nominal line, 75% load unless otherwise specified)
Parameter Min. Typ. Max. Remarks
Output Noise & Ripple
VI-200 3 mV pp From 10% of full rated VI-J00 10 mV pp output current of the
source converter to full load Input Voltage Range 5 Vdc 50 Vdc Output Voltage Deviation 0.5% From the output voltage of the
VI-200 source to which the
VI-RAM will be connected Full Load Current 10Amps E1, C1, I1 or M1
20Amps E2, C2, I2 or M2
Overload Current 30Amps At max. allowable baseplate
temperature DC Voltage Drop 0.34 0.41 Up to 10Amps
0.34 0.44 Up to 20Amps
0.34 0.75 Up to 30Amps (overload)
Dissipation = (DC voltage drop) x (Load current + 15 mA)
Isolation 500V Size 2.28" x 2.4" x 0.5" SlimMod and FinMod
(57,9 x 61,0 x 12,7) packages available
Weight 3.0 Ounces (85 Grams)
RMS
Input/Output to baseplate
Electrical Considerations
Transient Response and Dynamic Range: Full rated noise attenuation will be maintained at
the VI-RAM output for step load changes up to 10% of the rated output current of the source converter, with the VI-RAM exhibiting an underdamped output excursion of less than 10 mV 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 VI-RAM will improve the rejection over a larger dynamic range.
Sense Connection: Sense-in and sense-out connections are provided on the VI-RAM. Sense-in
connections must be connected to the corresponding sense connections on the Vicor converter. Sense-out pins on the VI-RAM must be connected between the VI-RAM power-output pins, and the point of load.
Output Load Characteristics: When used in combination with Vicor DC-DC converters, and
with sense leads connected, the VI-RAM will be stable for any non-inductive load.
DC Voltage Drop: Below full load, the input to output DC Voltage Drop is controlled to be an
essentially constant voltage which appears between the –IN and –OUT terminals. In overload the DC voltage drop will rise as current increases. A few tens of millivolts appears between the +IN and +OUT terminals. Care should be taken not to connect IN and OUT terminals (i.e. through scope probe returns, grounds, etc.), as attenuation will be adversely affected.
Product Grade Specifications
Parameter (Up to 10A) VI-RAM-E1 VI-RAM-C1 VI-RAM-I1 VI-RAM-M1
(Up to 20A) VI-RAM-E2 VI-RAM-C2 VI-RAM-I2 VI-RAM-M2
Storage Temp. -20°C to +105°C -40°C to +105°C -55°C to +105°C -65°C to +105°C Operating Temp. -10°C to +100° -25°C to +100°C -40°C to +100°C -55°C to +100°C (Baseplate)
12
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
5
6
7
8
9
4
3
2
1
.080 Dia (2) places Solder plate over copper alloy
.040 (1,0) Dia (7) places
Solder plate
over copper alloy
.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
+.030 (0,76)
-.000 (0)
.22 (5,6) Min.
.30 (7,6) Min.
1.75 (44,4) Max.
2.40 (61,0)
2.28 (57,9)
.12 (3,0)
.50 (12,7)
1.90 (48,3)
.65
(16,5)
.49
(12,4)
.15 (3,8)
.30 (7,6)
±.015 (0,38)
.15 (3,8)
2.10
(53,4)
1.30 (33,0)
.40
(10,2)
.35 (8,9)
± .015 (0,38)
1.40
(35,6)
1.00
(25,4)
.70
(17,8)
+Sense In –Sense In
+Sense
VI-RAM
1-800-735-6200
Attenuation vs. Frequency (typical)
Connection Diagram
L1
+
Mechanical Drawing
.01uF
.01uF
+ In Gate In
Gate Out – In
VI-200
to the converter
+ Out
+ S
Trim
S
Out
Input
10 V/cm
.01uF
.01uF
+ In + S In
S In In
VI-RAM
from the RAM
+ Out
+ S Out
N/C
S Out
Out
Output
20 mV/cm
Load
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