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LM2664M6X датащи(PDF) 10 Page - Texas Instruments |
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LM2664M6X датащи(HTML) 10 Page - Texas Instruments |
10 / 20 page LM2664 SNVS005E – NOVEMBER 1999 – REVISED DECEMBER 2014 www.ti.com The peak-to-peak output voltage ripple is determined by the oscillator frequency, the capacitance and ESR of the output capacitor C2: (2) Again, using a low ESR capacitor will result in lower ripple. 9.2.2.1 Paralleling Devices Any number of LM2664s can be paralleled to reduce the output resistance. 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: (3) Figure 12. Lowering Output Resistance by Paralleling Devices 9.2.2.2 Cascading Devices Cascading the LM2664 devices is an easy way to produce a greater negative voltage (a two-stage cascade circuit is shown in Figure 13). 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: ROUT = nRout_1 + n/2 ROUT_2 + ... + ROUT_n (4) NOTE 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. 10 Submit Documentation Feedback Copyright © 1999–2014, Texas Instruments Incorporated Product Folder Links: LM2664 |
Аналогичный номер детали - LM2664M6X |
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Аналогичное описание - LM2664M6X |
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