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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： | 4/10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 3 of 10
Set your site on VICOR at www.vicorpower.com
APPLICATION SCHEMATIC DRAWINGS USING VICOR CONVERTERS AND THE RAM
ELECTRICAL CHARACTERISTICS (CONT.)
DC-DC
Converter
+OUT
Vref
–OUT
+IN
SC
CTRAN
–IN
+OUT
+S
SC
–S
–OUT
+IN
PC
PR
–IN
RSENSE
5.1
22
μF
CTRAN*
*Optional Component
RHR
CHR*
LOAD
Figure 1
— Typical Configuration using Remote Sensing
DC-DC
Converter
+OUT
SC
–OUT
+IN
PC
PR
–IN
μRAM
+OUT
Vref
–OUT
+IN
SC
CTRAN
–IN
RSC
RHR
CTRAN*
CHR*
*Optional Component
20 kΩ
1 F
IRML6401
LOAD
Figure 2
— Typical Configuration using SC Control (Oppional CHR 25F maximum in SC configuration.)
FUNCTIONAL DESCRIPTION
The MicroRAM has an internal passive filter that
effectively attenuates ripple in the 50 kHz to 1 MHz
range. An active filter provides attenuation from low
frequency up to the 1 MHz range. The user must set the
headroom voltage of the active block with the external
RHR resistor to optimize performance. The MicroRAM
must be connected as shown in Figures 1 or 2 depending
on the load sensing method. The transient load current
performance can be increased by the addition of optional
CTRAN capacitance to the CTRAN pin. The low frequency
ripple attenuation can be increased by addition of
optional CHR capacitance to the VREF pin as shown in
Figures 3a and 3b, on p. 5.
Transient load current is supplied by the internal CTRAN
capacitance, plus optional external capacitance, during
the time it takes the converter loop to respond to the
increase in load. The MicroRAM’s active loop responds
in roughly one microsecond to output voltage
perturbations. There are limitations to the magnitude
and the rate of change of the transient current that the
MicroRAM can sustain while the converter responds.
See Figures 8 – 16, on pp. 6 and 7, for examples of
dynamic performance. A larger headroom voltage setting
will provide increased transient performance, ripple
attenuation and power dissipation while reducing overall
efficiency (see Figures 4a, 4b, 4c and 4d on p. 5).
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