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LM2664M6X 데이터시트(PDF) 7 Page - National Semiconductor (TI) |
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LM2664M6X 데이터시트(HTML) 7 Page - National Semiconductor (TI) |
7 / 9 page Other Applications (Continued) Cascading Devices Cascading the LM2664s is an easy way to produce a greater negative voltage (e.g. A two-stage cascade circuit is shown in Figure 4). If n is the integer representing the number of devices cas- caded, the unloaded output voltage V out is (-nVin). The effec- tive output resistance is equal to the weighted sum of each individual device: R out = nRout_1 + n/2 Rout_2 +...+Rout_n Note that, the number of n is practically limited since the in- creasing of n significantly reduces the efficiency, and in- creases the output resistance and output voltage ripple. Combined Doubler and Inverter In Figure 5, the LM2664 is used to provide a positive voltage doubler and a negative voltage converter. Note that the total current drawn from the two outputs should not exceed 50 mA. DS100031-10 FIGURE 3. Lowering Output Resistance by Paralleling Devices DS100031-11 FIGURE 4. Increasing Output Voltage by Cascading Devices www.national.com 7 |
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