VI-RAM-M1【PDF 1/4 页】VI-RAM RIPPLE ATTENUATOR MODULE

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Data Sheet

VI-RAM TM /VE-RAM (RoHS Compliant)

Features

? RoHS compliant (VE versions)

? Reduces output ripple to <3 mV pp

? Compatible with any VI-200/VI-J00-

based product: 5 to 50 Vdc output

Ripple Attenuator Modules

Full attenuation up to 20 A

No adjustments required

93 – 99% efficiency

Converter sense, trim, overvoltage

and overcurrent retained

VI-RAM Specifications

(typical at T BP = 25°C, nominal line, 75% load unless otherwise specified)

? Size: 2.28" x 2.4" x 0.5"

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

? CE Marked

Parameter

Output Noise & Ripple

VI-200

Min.

Typ.

Max.

3 mV pp

Remarks

From 10% of full rated

VI-J00

10 mV pp

output current of the

source converter to full load

Product Highlights

Ripple attenuator modules may be connected

to VI-200 or VI-J00 converters, FlatPACs,

Input Voltage Range

Output Voltage Deviation

5 Vdc

0.5%

50 Vdc

From the output voltage of

the VI-200 source to which

the VI-RAM will be connected

ComPACs or MegaModules, with output

voltages from 5 – 50 V, to limit output noise

to less than 3 mV peak-to-peak at loads up

to 20 A. Combining active and passive

Full Load Current

Overload Current

DC Voltage Drop

10 A

20 A

30 A

0.34 0.41

E1, C1, I1 or M1

E2, C2, I2 or M2

At max. operating baseplate

temperature

Up to 10 A

filtering, the VI-RAM attenuates both

low frequency input power source

0.34 0.44

0.34 0.75

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

Up to 20 A

Up to 30 A (overload)

fundamental and harmonics, as well as high

Isolation

500V RMS

Input/Output to baseplate

Ounces(Grams)

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

Size

Weight

E,C-Grade

I,M-Grade

3.6(102)

2.28" x 2.4" x 0.5" SlimMod and FinMod

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

3.0(85)

3.7(105) 3.8(107)

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.

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 10 A) VI-RAM-E1

(Up to 20 A) VI-RAM-E2

Storage Temp. -20°C to +105°C

VI-RAM-C1

VI-RAM-C2

-40°C to +105°C

VI-RAM-I1

VI-RAM-I2

-55°C to +105°C

VI-RAM-M1

VI-RAM-M2

-65°C to +105°C

Operating Temp.

(Baseplate)

-10°C to +100°

-25°C to +100°C

-40°C to +100°C

-55°C to +100°C

Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715

VI-RAM Ripple Attenuator Modules

Rev.1.6

Page 1 of 4

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