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LM2767 Datasheet(PDF) 11 Page - Texas Instruments |
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LM2767 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page R OUT = R OUT of each LM 2767 Number of Devices LM2767 www.ti.com SNVS069D – FEBRUARY 2000 – REVISED AUGUST 2015 9.2.2.3 Paralleling Devices Any number of LM2767 devices can be paralleled to reduce the output resistance. Because there is no closed loop feedback, as found in regulated circuits, stable operation is assured. Each device must have its own pumping capacitor C1, while only one output capacitor COUT is needed as shown in Figure 12. The composite output resistance is: (4) Figure 12. Lowering Output Resistance by Paralleling Devices 9.2.2.4 Cascading Devices Cascading the several LM2767 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 increasing the number of cascading stages is practically limited because it significantly reduces the efficiency, increases the output resistance and output voltage ripple. Figure 13. Increasing Output Voltage By Cascading Devices 9.2.2.5 Regulating VOUT It is possible to regulate the output of the LM2767 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. The following conditions must be satisfied simultaneously for worst case design: 2VIN_MIN > VOUT_MIN + VDROP_MAX (LP2980) + IOUT_MAX × ROUT_MAX (6) 2VIN_MAX < VOUT_MAX + VDROP_MIN (LP2980) + IOUT_MIN × ROUT_MIN (7) Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2767 |
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