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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2672EP датащи(PDF) 13 Page - National Semiconductor (TI) |
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LM2672EP датащи(HTML) 13 Page - National Semiconductor (TI) |
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13 / 25 page  LM2672EP Series Buck Regulator Design Procedure (Fixed Output) (Continued) PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) 7. Frequency Synchronization (optional) The LM2672EP (oscillator) can be synchronized to run with an external oscillator, using the sync pin (pin 3). By doing so, the LM2672EP can be operated at higher frequencies than the standard frequency of 260 kHz. This allows for a reduction in the size of the inductor and output capacitor. As shown in the drawing below, a signal applied to a RC filter at the sync pin causes the device to synchronize to the frequency of that signal. For a signal with a peak-to-peak amplitude of 3V or greater,a1k Ω resistor and a 100 pF capacitor are suitable values. 7. Frequency Synchronization (optional) For all applications, usea1k Ω resistor and a 100 pF capacitor for the RC filter. Inductor Value Selection Guides (For Continuous Mode Operation) 20097829 FIGURE 4. LM2672-3.3EP 20097830 FIGURE 5. LM2672-5.0EP 20097831 FIGURE 6. LM2672-12EP 20097832 FIGURE 7. LM2672-ADJEP www.national.com 13 |
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