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LM2682MMX Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2682MMX Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 7 page Application Information (Continued) +5V to −5V Regulated Voltage Converter Another application in which the LM2682 can be used is for generating a −5V regulated supply from a +5V unregulated supply. This involves using an op-amp and a reference and is connected as shown in Figure 2. The LM358 op-amp was chosen for its low cost and versatility and the LM4040-5.0 reference was chosen for its low bias current requirement. Of course other combinations may be used at the designer’s discretion to fit accuracy, efficiency, and cost requirements. With this configuration the circuit is well regulated and is still capable of providing nearly 10 mA of output current. With a 9 mA load the circuit can typically maintain 5% regulation on the output voltage with the input varying anywhere from 4.5V to the maximum of 5.5V. With less load the results are even better. Voltage ripple concerns are reduced in this case since the ripple at the output of the LM2682 is reduced at the out- put by the PSRR of the op-amp used. Paralleling Devices Any number of devices can be paralleled to reduce the out- put resistance. As shown in Figure 3, each device must have its own pumping capacitors, C1 and C2, but only one shared output capacitor is required. The effective output resistance is the output resistance of one device divided by the number of devices used in parallel. Paralleling devices also gives the capability of increasing the maximum output current. The maximum output current now becomes the maximum output current for one device multiplied by the number of devices used in parallel. For example, if you parallel two devices you can get 20 mA of output current and have half the output re- sistance of one device supplying 10 mA. DS100997-5 FIGURE 3. Paralleling Devices www.national.com 5 |
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