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LM2661M 数据表(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM2661M
功能描述  Switched Capacitor Voltage Converter
Download  12 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2661M 数据表(HTML) 9 Page - National Semiconductor (TI)

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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 cascaded, 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 increases the out-
put resistance and output voltage ripple.
DS012911-23
FIGURE 5. Increasing Output Voltage by Cascading Devices
DS012911-24
FIGURE 6. Generating −3V
in from +Vin
DS012911-25
FIGURE 7. Generating +3V
in from +Vin
www.national.com
9


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