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PRELIMINARY

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

MicroRAM

Rev. 1.1

Page 1 of 8

Features

• >40dB ripple attenuation from

60Hz to 1MHz

• Integrated OR’ing diode supports

N+1 redundancy

• Significantly improves load

transient response

• Efficiency up to 98%

• User selectable performance optimization

• Combined active and passive filtering

• 3-30Vdc input range

• 20 and 30 Ampere ratings

Product Highlights

Vicor’s MicroRAM output ripple attenuation

module combines both active and passive

filtering to achieve greater than 40dB of

noise attenuation from 60Hz to 1Mhz. The

MicroRAM operates over a range of 3 to

30Vdc, is available in either 20 or 30A

models and is compatible with most

manufacturers switching converters

including Vicor’s 1st and 2nd Generation

DC-DC converters.

The MicroRAM’s closed loop architecture

greatly improves load transient response and

with dual mode control, insures precise point

of load voltage regulation, The MicroRAM

supports redundant and parallel operation

with its integrated OR’ing diode function.

It is available in Vicor’s standard micro

package (quarter brick) with a variety of

terminations for through hole, socket or

surface mount applications.

Data Sheet

MicroRAM

TM

Output Ripple Attenuation Module

Shown actual size:

2.28 x 1.45 x 0.5 in

57,9 x 36,8 x 12,7 mm

Absolute Maximum Ratings

Thermal Resistance

Parameter

Typ

Unit

Baseplate to sink; flat, greased surface

0.16

°C/Watt

Baseplate to sink; with thermal pad (P/N 20264)

0.14

°C/Watt

Baseplate to ambient

8.0

°C/Watt

Baseplate to ambient; 1000 LFM

1.9

°C/Watt

uRAM

2

C

2

1

Product

Baseplate

1 = Slotted

2 = Threaded

3 = Thru-hole

Pin Style*

1 = Short Pin

2 = Long Pin

S = Short ModuMate

N = Long ModuMate

Product Grade

C = –20°C to +100°C

T = –40°C to +100°C

H = –40°C to +100°C

M = –55°C to +100°C

Type

2= 20A

3= 30A

Part Numbering

*Pin styles S & N are compatible with the ModuMate interconnect system for socketing and surface mounting.

Patents Pending

Parameter

Rating

Unit

Notes

+In to –In

30

Vdc

Continuous

+In to –In

40

Vdc

100ms

Load current

40

Adc

Continuous

Ripple Input (Vp-p)

100

mV

60Hzc100 kHz

Ripple Input (Vp-p)

500

mV

100kHz –2MHz

Mounting torque

4-6 (0.45-0.68)

In. lbs (Nm)

6 each, 4-40 screw

Pin soldering temperature

500 (260)

°F (°C)

5 sec; wave solder

Pin soldering temperature

750 (390)

°F (°C)

7 sec; wave solder

Storage temperature (C, T-Grade)

-40 to +125

°C

Storage temperature (H-Grade)

-55 to +125

°C

Storage temperature (M-Grade)

-65 to +125

°C

Operating temperature (C-Grade)

-20 to +100

°C

Baseplate

Operating temperature (T, H-Grade)

-40 to +100

°C

Baseplate

Operating temperature (M-Grade)

-55 to +100

°C

Baseplate