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LM2661MX_NOPB Datasheet(PDF) 11 Page - Texas Instruments |
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LM2661MX_NOPB Datasheet(HTML) 11 Page - Texas Instruments |
11 / 20 page LM2660 www.ti.com SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013 CASCADING DEVICES Cascading the LM2660s is an easy way to produce a greater negative voltage (as shown in Figure 19). 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: (5) A three-stage cascade circuit shown in Figure 20 generates −3Vin, from Vin. Cascading is also possible when devices are operating in doubling mode. In Figure 21, two devices are cascaded to generate 3Vin. An example of using the circuit in Figure 20 or Figure 21 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 output resistance and output voltage ripple. Figure 19. Increasing Output Voltage by Cascading Devices Figure 20. Generating −3Vin from +Vin Figure 21. Generating +3Vin from +Vin Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2660 |
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