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LM2664M6 датащи(PDF) 7 Page - Texas Instruments

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номер детали LM2664M6
подробное описание детали  Switched Capacitor Voltage Converter
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LM2664M6 датащи(HTML) 7 Page - Texas Instruments

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PARALLELING DEVICES
Any number of LM2664s 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 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 ef-
fective 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
increasing 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.
10003110
FIGURE 3. Lowering Output Resistance by Paralleling Devices
10003111
FIGURE 4. Increasing Output Voltage by Cascading Devices
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7


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