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参数资料
| 型号： | UARAM2M22 |
| 厂商： | ASC CAPACITORS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, DMA7 |
| 文件页数： | 3/10页 |
| 文件大小： | 880K |
| 代理商： | UARAM2M22 |
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
MicroRAM Data Sheet
Rev. 1.4
Page 2 of 10
Set your site on VICOR at www.vicorpower.com
Parameter
Min
Typ
Max
Unit
Notes
Operating current range
No internal current limiting. Converter input must be
RAM2xxx
0.02
20
A
properly fused such that the RAM output current
RAM3xxx
0.02
30
A
does not exceed the maximum operating current
rating by more than 30% under a steady state condition.
Operating input voltage
3.0
30
Vdc
Continuous
Transient output response
50
mVp-p
Step load change;
Load current step <1A/sec
see Figures 9, 12, & 15, pp. 6-7
Transient output response
Optional capacitance CTRAN can be used
Load current step <1A/sec
50
mVp-p
to increase transient current capability; See Figures
(CTRAN = 820 F)
1 & 2 on p. 3 and Figures 10, 13, & 16 on pp. 6-7
VHR headroom voltage range
1
See Figures 5, 6 & 7
@ 1A load
325
425
mV
See Table 1 for headroom setting resistor values
Output ripple
10
mVp-p
Ripple frequency 60 Hz to 100 kHz; optional capacitor
Input Vp-p = 100 mV
5
mVrms
CHR = 100 F required to increase low frequency
attenuation as shown in Figures 3a and 3b
see Figures 8, 11, & 14, pp. 6 – 7
Output ripple
10
mVp-p
Ripple frequency 100 kHz to 2 MHz;
Input Vp-p = 500 mV
5
mVrms
see Figures 8, 11, & 14, pp. 6-7
SC output voltage
2
1.23
Vdc
See Table 1 RSC value
OR’ing threshold
10
mV
Vin – Vout
RAM bias current
60
mA
Power dissipation
RAM2xxx VHR = 380 mV@1 A
7.5
W
Vin = 28 V; Iout = 20 A
RAM3xxx VHR = 380 mV@1 A
11.5
W
Vin = 28 V; Iout = 30 A
RAM 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.
RHR = (RAM +Out/VHR) x 2.3 k (see Table 1 for example values)
2
SC resistor is required to trim the converter output up to accommodate the headroom of the RAM 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 RSC resistor values)
RSC = ((RAM +Out)/1.23 V x 1k) – 2 k
RAM Out
3.0 V
5.0 V
12.0 V
15.0 V
24.0 V
28.0 V
VHR @ 1A
375 mV
RHR Value (ohms)
18.4 k
30.6 k
73.6 k
92.0 k
147.2 k
171.7 k
RSC Value (ohms)
0.439 k
2.07 k
7.76 k
10.20 k
17.50 k
20.76 k
Table 1 – RHR and RSC are computed values for a 375 mV case. To compute different headroom voltages, or for standard resistor
values and tolerances, use Notes 1 and 2.
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