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LM2672EP bảng dữ liệu(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM2672EP
Giải thích chi tiết về linh kiện  Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LM2672EP bảng dữ liệu(HTML) 13 Page - National Semiconductor (TI)

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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
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