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LM2665M6X 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 LM2665M6X
상세설명  Switched Capacitor Voltage Converter
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LM2665M6X 데이터시트(HTML) 11 Page - Texas Instruments

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LM2665
www.ti.com
SNVS009H – NOVEMBER 1999 – REVISED MARCH 2016
Product Folder Links: LM2665
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Copyright © 1999–2016, Texas Instruments Incorporated
Figure 12. Lowering Output Resistance By Paralleling Devices
9.2.1.2.4
Cascading Devices
Cascading the LM2665 devices is an easy way to produce a greater voltage (a two-stage cascade circuit is
shown in Figure 13).
The effective output resistance is equal to the weighted sum of each individual device:
ROUT = 1.5 ROUT_1 + ROUT_2
(5)
Note that the increasing of the number of cascading stages is pracitically limited since it significantly reduces the
efficiency, increases the output resistance and output voltage ripple.
Figure 13. Increasing Output Voltage By Cascading Devices
9.2.1.2.5
Regulating VOUT
It is possible to regulate the output of the LM2665 by use of a low dropout regulator (such as LP2980-5.0). The
whole converter is depicted in Figure 14.
A different output voltage is possible by use of LP2980-3.3, LP2980-3.0, or LP2980-ADJ.
Note that the following conditions must be satisfied simultaneously for worst-case design:
2VIN_MIN > VOUT_MIN + VDROP_MAX (LP2980) + IOUT_MAX × ROUT_MAX (LM2665)
(6)
2VIN_MAX < VOUT_MAX +VDROP_MIN (LP2980) + IOUT_MIN × ROUT_MIN (LM2665)
(7)


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