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LM828M5X Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LM828M5X Datasheet(HTML) 7 Page - National Semiconductor (TI) |
7 / 8 page Other Applications (Continued) Combined Doubler and Inverter In Figure 5, 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. Regulating V OUT It is possible to regulate the negative output of the LM828 by use of a low dropout regulator (such as the LP2980). The whole converter is depicted in Figure 6. This converter can give a regulated output from −1.8V to −5.5V by choosing the proper resistor ratio: V out = Vref (1+R1/R2) where, V ref = 1.23V Note that the following conditions must be satisfied simulta- neously for worst case design: V in_min >Vout_min +Vdrop_max (LP2980) +I out_max xRout_max (LM828) V in_max < Vout_max +Vdrop_min (LP2980) +I out_min xRout_min (LM828) DS100137-11 FIGURE 5. Combined Voltage Doubler and Inverter DS100137-12 FIGURE 6. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator www.national.com 7 |
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