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参数资料
| 型号： | LM2664MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 10/12页 |
| 文件大小： | 340K |
| 代理商： | LM2664MDC |
Other Applications (Continued)
Cascading Devices
Cascading the LM2664s 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 effec-
tive output resistance is equal to the weighted sum of each
individual device:
R
out = nRout_1 + n/2 Rout_2 +...+Rout_n
Note that, the number of n is practically limited since the in-
creasing of n significantly reduces the efficiency, and in-
creases the output resistance and output voltage ripple.
Combined Doubler and Inverter
In Figure 5, the LM2664 is used to provide a positive voltage
doubler and a negative voltage converter. Note that the total
current drawn from the two outputs should not exceed 50
mA.
DS100031-10
FIGURE 3. Lowering Output Resistance by Paralleling Devices
DS100031-11
FIGURE 4. Increasing Output Voltage by Cascading Devices
LM2664
www.national.com
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