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參數(shù)資料
| 型號： | LM828MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 56 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 221K |
| 代理商： | LM828MWC |
Application Information (Continued)
Low ESR Capacitor Manufacturers (Continued)
Manufacturer
Phone
Capacitor Type
Taiyo Yuden
(800)-348-2496
Ceramic chip capacitors
Tokin
(408)-432-8020
Ceramic chip capacitors
Other Applications
Paralleling Devices
Any number of LM828s can be paralleled to reduce the
output resistance. Each device must have its own pumping
capacitor C
1, while only one output capacitor Cout is needed
as shown in Figure 3. The composite output resistance is:
Cascading Devices
Cascading the LM828s is an easy way to produce a greater
negative voltage (e.g. A two-stage cascade circuit is shown
in Figure 4).
If n is the integer representing the number of devices cas-
caded, the unloaded output voltage V
out is (-nVin). The ef-
fective output resistance is equal to the weighted sum of
each individual device:
R
out =nRout_1 + n/2 Rout_2 +...+Rout_n
This can be seen by first assuming that each device is 100
percent efficient. Since the output voltage is different on
each device the output current is as well. Each cascaded
device sees less current at the output than the previous so
the R
OUT voltage drop is lower in each device added. Note
that, the number of n is practically limited since the increas-
ing of n significantly reduces the efficiency, and increases
the output resistance and output voltage ripple.
Combined Doubler and Inverter
DS100137-9
FIGURE 3. Lowering Output Resistance by Paralleling Devices
DS100137-10
FIGURE 4. Increasing Output Voltage by Cascading Devices
LM828
www.national.com
6
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