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LM2767M5X датащи(PDF) 5 Page - Texas Instruments

номер детали LM2767M5X
подробное описание детали  LM2767 Switched Capacitor Voltage Converter
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LM2767M5X датащи(HTML) 5 Page - Texas Instruments

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LM2767
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SNVS069C – FEBRUARY 2000 – REVISED MAY 2013
Typical Performance Characteristics (continued)
(Circuit of Figure 4, VIN = 5V, TA = 25°C unless otherwise specified)
Switching Frequency vs
Switching Frequency vs
Supply Voltage
Temperature
Figure 11.
Figure 12.
Output Ripple vs
Load Current
Figure 13.
CIRCUIT DESCRIPTION
The LM2767 contains four large CMOS switches which are switched in a sequence to double the input supply
voltage. Energy transfer and storage are provided by external capacitors. Figure 14 illustrates the voltage
conversion scheme. When S2 and S4 are closed, C1 charges to the supply voltage V+. During this time interval,
switches S1 and S3 are open. In the next time interval, S2 and S4 are open; at the same time, S1 and S3 are
closed, the sum of the input voltage V+ and the voltage across C1 gives the 2V+ output voltage when there is no
load. The output voltage drop when a load is added is determined by the parasitic resistance (Rds(on) of the
MOSFET switches and the ESR of the capacitors) and the charge transfer loss between capacitors. Details will
be discussed in the following application information section.
Copyright © 2000–2013, Texas Instruments Incorporated
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