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LM2660M データシート(PDF) 11 Page - Texas Instruments

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部品番号 LM2660M
部品情報  LM2660 Switched Capacitor Voltage Converter
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LM2660M データシート(HTML) 11 Page - Texas Instruments

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LM2660
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SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013
CASCADING DEVICES
Cascading the LM2660s is an easy way to produce a greater negative voltage (as shown in Figure 19). If n is the
integer representing the number of devices cascaded, the unloaded output voltage Vout is (−nVin). The effective
output resistance is equal to the weighted sum of each individual device:
(5)
A three-stage cascade circuit shown in Figure 20 generates
−3Vin, from Vin.
Cascading is also possible when devices are operating in doubling mode. In Figure 21, two devices are
cascaded to generate 3Vin.
An example of using the circuit in Figure 20 or Figure 21 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 output resistance and output voltage ripple.
Figure 19. Increasing Output Voltage by Cascading Devices
Figure 20. Generating
−3Vin from +Vin
Figure 21. Generating +3Vin from +Vin
Copyright © 1999–2013, Texas Instruments Incorporated
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