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參數(shù)資料
| 型號： | uRAM3MS1 |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Output Ripple Attenuation Module |
| 中文描述： | 輸出紋波衰減模塊 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大小： | 1184K |
| 代理商： | URAM3MS1 |
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
MicroRAM Data Sheet
Rev. 1.1
Page 2 of 8
Set your site on VICOR at www.vicorpower.com
PRELIMINARY
Parameter
Min
Typ
Max
Unit
Notes
Operating current range
μRAM2xxx
μRAM3xxx
No internal current limiting. Converter input must be
properly fused such that the μRAM output current
does not exceed the maximum operating current
rating by more than 30% under a steady state condition.
0.02
0.02
20
30
A
A
Operating input voltage
3.0
30
Vdc
Continuous
Transient output response
Load current step <1A/μsec
50
mVp-p
Step load change;
see Figures 9, 12, & 15, pp. 6-7
Transient output response
Load current step <1A/μsec
(C
TRAN
= 820μF)
Optional capacitance C
TRAN
can be used
to increase transient current capability; See Figures
1 & 2 on p. 3 and Figures 10, 13, & 16 on pp. 6-7
50
mVp-p
V
HR
headroom voltage range
(1)
@ 1A load
See Figures 5, 6 & 7
See Table 1 for headroom setting resistor values
325
425
mV
Output ripple
Input Vp-p = 100mV
10
5
mVp-p
mVrms
Ripple frequency 60Hz to 100kHz; optional capacitor
C
HR
= 100μF required to increase low frequency
attenuation as shown in Figures 3a and 3b
see Figures 8, 11, & 14, pp. 6-7
Ripple frequency 100kHz to 2MHz;
see Figures 8, 11, & 14, pp. 6-7
Output ripple
Input Vp-p = 500mV
10
5
mVp-p
mVrms
SC output voltage
(2)
1.23
Vdc
See Table 1 R
SC
value
OR’ing threshold
10
mV
Vin – Vout
μRAM bias current
60
mA
Power Dissipation
μRAM2xxx V
HR
= 380mV@1A
7.5
W
Vin = 28V; Iout = 20A
μRAM3xxx V
HR
= 380mV@1A
11.5
W
Vin = 28V; Iout = 30A
μRAM MODULE SPECIFICATIONS
(-20°C to +100°C baseplate temperature)
Electrical Characteristics
Electrical characteristics apply over the full operating range of input voltage, output power and baseplate temperature, unless
otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate.
(1)
Headroom is the voltage difference between the +Input and +Output pins.
R
HR
= (μRAM +Out/V
HR
) x 2.3k (see Table 1 for example values)
(2)
SC resistor is required to trim the converter output up to accommodate the headroom of the μRAM module when remote sense
is not used. This feature can only be used when the trim reference of the converter is in the 1.21 to 1.25 Volt range.
(see Table 1 with calculated R
SC
resistor values)
R
SC
= ((μRAM +Out)/1.23V x 1k) – 2k
μRAM Out
3.0V
5.0V
12.0V
15.0V
24.0V
28.0V
V
HR
@ 1A
375mV
375mV
375mV
375mV
375mV
375mV
R
HR
Value (ohms)
18.4k
30.6k
73.6k
92.0k
147.2k
171.7k
R
SC
Value (ohms)
0.439k
2.07k
7.76k
10.20k
17.50k
20.76k
Table 1
—R
HR
and R
SC
are computed values for a 375mV case. To compute different headroom voltages, or for standard resistor
values and tolerances, use Notes 1 and 2.
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