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LM2664M6 датащи(PDF) 7 Page - Texas Instruments |
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LM2664M6 датащи(HTML) 7 Page - Texas Instruments |
7 / 9 page Other Applications PARALLELING DEVICES Any number of LM2664s can be paralleled to reduce the output resistance. Each device must have its own pumping capacitor C 1, while only one output capacitor Cout is needed as shown in Figure 3. The composite output resistance is: 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 ef- fective 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 increasing 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. 10003110 FIGURE 3. Lowering Output Resistance by Paralleling Devices 10003111 FIGURE 4. Increasing Output Voltage by Cascading Devices www.national.com 7 |
Аналогичный номер детали - LM2664M6 |
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Аналогичное описание - LM2664M6 |
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