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LM2665M6X 데이터시트(PDF) 11 Page - Texas Instruments |
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LM2665M6X 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 20 page 11 LM2665 www.ti.com SNVS009H – NOVEMBER 1999 – REVISED MARCH 2016 Product Folder Links: LM2665 Submit Documentation Feedback 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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