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PDF uRAM2M11 Data sheet ( Hoja de datos )

Número de pieza uRAM2M11
Descripción Output Ripple Attenuation Module
Fabricantes Vicor Corporation 
Logotipo Vicor Corporation Logotipo



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45
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
PRELIMINARY
Data Sheet
MicroRAMTM
Output Ripple Attenuation Module
Patents Pending
Shown actual size:
2.28 x 1.45 x 0.5 in
57,9 x 36,8 x 12,7 mm
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.
Absolute Maximum Ratings
Parameter
+In to –In
+In to –In
Load current
Ripple Input (Vp-p)
Ripple Input (Vp-p)
Mounting torque
Pin soldering temperature
Pin soldering temperature
Storage temperature (C, T-Grade)
Storage temperature (H-Grade)
Storage temperature (M-Grade)
Operating temperature (C-Grade)
Operating temperature (T, H-Grade)
Operating temperature (M-Grade)
Thermal Resistance
Rating
30
40
40
100
500
4-6 (0.45-0.68)
500 (260)
750 (390)
-40 to +125
-55 to +125
-65 to +125
-20 to +100
-40 to +100
-55 to +100
Unit
Vdc
Vdc
Adc
mV
mV
In. lbs (Nm)
°F (°C)
°F (°C)
°C
°C
°C
°C
°C
°C
It is available in Vicor’s standard micro
package (quarter brick) with a variety of
terminations for through hole, socket or
surface mount applications.
Parameter
Baseplate to sink; flat, greased surface
Baseplate to sink; with thermal pad (P/N 20264)
Baseplate to ambient
Baseplate to ambient; 1000 LFM
Typ
0.16
0.14
8.0
1.9
Notes
Continuous
100ms
Continuous
60Hzc100 kHz
100kHz –2MHz
6 each, 4-40 screw
5 sec; wave solder
7 sec; wave solder
Baseplate
Baseplate
Baseplate
Unit
°C/Watt
°C/Watt
°C/Watt
°C/Watt
Part Numbering
uRAM 2
C
21
Product
Type
2 = 20A
3 = 30A
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
Pin Style*
1 = Short Pin
2 = Long Pin
S = Short ModuMate
N = Long ModuMate
Baseplate
1 = Slotted
2 = Threaded
3 = Thru-hole
*Pin styles S & N are compatible with the ModuMate interconnect system for socketing and surface mounting.
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
MicroRAM
Set your site on VICOR at www.vicorpower.com
Rev. 1.1
Page 1 of 8

1 page




uRAM2M11 pdf
µRAM2xxx
PRELIMINARY
20.00
Ripple Attenuation @ 28V (Room Temp.)
20.00
Ripple Attenuation @ 5V (Room Temp.)
0.00
0.00
-20.00
-20.00
-40.00
-40.00
-60.00
-60.00
-80.00
10
100
1,000
10,000
100,000
1,000,000
10,000,000
Freq. (Hz)
10A, 100uF Vref
10A, No Vref Cap
-80.00
10
100
1,000
10,000
100,000
1,000,000
10,000,000
Freq. (Hz)
10A, 100uF Vref
10A, No Vref Cap
Figure 3a, 3b—Curves demonstrating the small signal attenuation performance as measured on a network analyzer with a typical
module at (a) 28V and 10A output and (b) 5V and 10A. The low frequency attenuation can be enhanced by connecting a 100µF
capacitor, CHR, to the VREF pin as shown in Figures 1 and 2.
-0
Vout=3V Iload=20A
100 degrees baseplate temperature
-25
Rhr=28k (Vheadroom=90mV)
27k (100mV)
26k (110mV)
25k (122mV)
24k (135mV)
23k (150mV)
22k (160mV)
-0
-25
Vout=28V Iload=20A
100 degrees baseplate temperature
Rhr=260k (Vheadroom=90mV)
250k (100mV)
240k (110mV)
230k (122mV)
220k (135mV)
210k (150mV)
200k (160mV)
-50 -50
-75
10Hz
100Hz
1.0KHz
... DB(V(VOUT))
10KHz
17k (260mV)
18k (240mV)
19k (217mV)
20k (197mV)
21k (180mV)
100KHz
Frequency
1.0MHz
-75
10Hz
100Hz
1.0KHz
... DB(V(VOUT))
10KHz
Frequency
150k (260mV)
160k (240mV)
170k (217mV)
180k (197mV)
190k (180mV)
100KHz
1.0MHz
Figure 4a-4b—Simulated graphs demonstrating the tradeoff of attenuation versus headroom setting at 20 Amps and an equivalent
100°C baseplate temperature at 3V and 28V.
-10
-20
Rhr=28k
27k
-30
26k
100khz 3V
500khz 3V
1Mhz 3V
25k
-40
24k
23k
-50
22k
21k
20k
19k
-60
18k
17k
-70
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Watts
-10
-20
Rhr=260k
250k
-30
240k
230k
28V 20A
-40
-50
220k
210k
200k
190k
180k
-60
100khz 28V
500khz 28V
1Mhz 28V
170k
160k
150k
-70
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Watts
Figure 4c-4d—MicroRam attenuation vs. power dissipation at 3V 20A, and 28V 20A.
Notes:The measurements in Figures 8-16 were taken with a µRAM2C21 and standard scope probes with a 20MHz bandwidth scope setting. The criteria for transient current
capability was as follows: The transient load current step was incremented from 10A to the peak value indicated, then stepped back to 10A until the resulting output peak to
peak was around 40mV.
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
MicroRAM
Rev. 1.1
Page 5 of 8
Set your site on VICOR at www.vicorpower.com

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