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LM828M5 Datasheet(PDF) 7 Page - Texas Instruments |
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LM828M5 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 15 page LM828 www.ti.com SNOS035D – MARCH 2010 – REVISED MAY 2013 CASCADING DEVICES Cascading the LM828s is an easy way to produce a greater negative voltage (e.g. A two-stage cascade circuit is shown in Figure 14). 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 (5) This can be seen by first assuming that each device is 100 percent efficient. Since the output voltage is different on each device the output current is as well. Each cascaded device sees less current at the output than the previous so the ROUT voltage drop is lower in each device added. 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 14. Increasing Output Voltage by Cascading Devices COMBINED DOUBLER AND INVERTER In Figure 15, the LM828 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 40 mA. Figure 15. Combined Voltage Doubler and Inverter Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM828 |
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