LM2682MX/NOPB【PDF 5/7 页】SWITCHED CAPACITOR CONVERTER, 15 kHz SWI

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Application Information (Continued)

The amount of output voltage ripple is determined by the

output capacitor C3 and the output current as shown in this

equation:

RIPPLE P-P =IOUT x (2xESRC3 + 1/[2x(fOSCxC3)])

Once again a larger capacitor with smaller ESR will give

better results.

+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

output by the PSRR of the op-amp used.

PARALLELING DEVICES

Any number of devices can be paralleled to reduce the

output 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 resistance of one device supplying 10

mA.

10099705

FIGURE 3. Paralleling Devices

LM2682

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