參數(shù)資料
型號(hào): LM2661MM/NOPB
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8
封裝: MINI, SO-8
文件頁(yè)數(shù): 13/13頁(yè)
文件大?。?/td> 358K
代理商: LM2661MM/NOPB
Other Applications (Continued)
CASCADING DEVICES
Cascading the LM2660s (or LM2661s) is an easy way to
produce a greater negative voltage (as shown in Figure 5). If
n is the integer representing the number of devices cas-
caded, the unloaded output voltage V
out is (nVin). The
effective output resistance is equal to the weighted sum of
each individual device:
A three-stage cascade circuit shown in Figure 6 generates
3V
in, from Vin.
Cascading is also possible when devices are operating in
doubling mode. In Figure 7, two devices are cascaded to
generate 3V
in.
An example of using the circuit in Figure 6 or Figure 7 is
generating +15V or 15V from a +5V input.
Note that, the number of n is practically limited since the
increasing of n significantly reduces the efficiency and in-
creases the output resistance and output voltage ripple.
01291123
FIGURE 5. Increasing Output Voltage by Cascading Devices
01291124
FIGURE 6. Generating 3V
in from +Vin
LM2660/LM2661
www.national.com
9
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