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LM2661MM Arkusz danych(PDF) 9 Page - National Semiconductor (TI) |
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LM2661MM Arkusz danych(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Other Applications (Continued) CASCADING DEVICES Cascading the LM2660s (or LM2661s) is an easy way to produce a greater negative voltage (as shown in Figure 5). If n is the integer representing the number of devices cascaded, the unloaded output voltage V out is (−nVin). The effective output resistance is equal to the weighted sum of each individual device: A three-stage cascade circuit shown in Figure 6 generates −3V in, from Vin. Cascading is also possible when devices are operating in doubling mode. In Figure 7, two devices are cascaded to generate 3V in. An example of using the circuit in Figure 6 or Figure 7 is generating +15V or −15V from a +5V input. Note that, the number of n is practically limited since the increasing of n significantly reduces the efficiency and increases the out- put resistance and output voltage ripple. DS012911-23 FIGURE 5. Increasing Output Voltage by Cascading Devices DS012911-24 FIGURE 6. Generating −3V in from +Vin DS012911-25 FIGURE 7. Generating +3V in from +Vin www.national.com 9 |
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