VI-RAM Vicor Corporation, VI-RAM Datasheet

VI-RAM

Manufacturer Part Number

VI-RAM

Description

Ripple Attenuator Modules

Manufacturer

Vicor Corporation

Datasheet

1.VI-RAM.pdf (2 pages)

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VI-RAM™

Ripple Attenuator

Modules

Features

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.

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

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

No Adjustments Required

93-99% Efficiency

Converter Sense, Trim, Overvoltage

and Overcurrent Retained

Size: 2.28" x 2.4" x 0.5"

CE Marked

1-800-735-6200

Parameter

Output Noise & Ripple

Input Voltage Range

Output Voltage Deviation

Full Load Current

Overload Current

DC Voltage Drop

Isolation

Size

Weight

Electrical Considerations

Product Grade Specifications

VI-RAM Specifications

(typical at T

Transient Response and Dynamic Range:

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:

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:

with sense leads connected, the VI-RAM will be stable for any non-inductive load.

DC Voltage Drop:

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.

Parameter (Up to 10A)

Storage Temp.

Operating Temp.

(Baseplate)

VI-200

VI-J00

(Up to 20A)

Dissipation = (DC voltage drop) x (Load current + 15 mA)

= 25°C, nominal line, 75% load unless otherwise specified)

Below full load, the input to output DC Voltage Drop is controlled to be an

Sense-in and sense-out connections are provided on the VI-RAM. Sense-in

-20°C to +105°C

-10°C to +100°

VI-RAM-E1

VI-RAM-E2

5 Vdc

Min.

0.34

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

3.0 Ounces (85 Grams)

2.28" x 2.4" x 0.5"

When used in combination with Vicor DC-DC converters, and

500V

0.5%

Typ.

-40°C to +105°C -55°C to +105°C

-25°C to +100°C -40°C to +100°C

RMS

VI-RAM-C1

VI-RAM-C2

10 mV pp

3 mV pp

10Amps

20Amps

30Amps

Full rated noise attenuation will be maintained at

50 Vdc

Max.

0.41

0.44

0.75

Remarks

From 10% of full rated

output current of the

source converter to full load

From the output voltage of the

VI-200 source to which the

VI-RAM will be connected

E1, C1, I1 or M1

E2, C2, I2 or M2

At max. allowable baseplate

temperature

Up to 10Amps

Up to 20Amps

Up to 30Amps (overload)

Input/Output to baseplate

SlimMod and FinMod

packages available

VI-RAM-I1

VI-RAM-I2

-65°C to +105°C

-55°C to +100°C

VI-RAM-M1

VI-RAM-M2

Related parts for VI-RAM

VI-RAM Summary of contents

Page 1

... Electrical Considerations Transient Response and Dynamic Range: 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 ...

Page 2

... Solder plate over copper alloy Product ID this surface .30 (7,6) Min. .22 (5,6) Min. +.030 (0,76) .50 (12,7) -.000 (0) .01 Output from the RAM 20 mV/ Out + S Out + S In N/C VI-RAM Load – – S Out – Out – In Function +In +Sense In –Sense In –In +Out +Sense NC –Sense –Out 2.40 (61,0) 1.75 (44,4) Max. Aluminum Base ...

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